will the average American Christian be rewarded with Heaven?

Luke 18:18 And a ruler asked him, “Good Teacher, what must I do to inherit eternal life?” 19And Jesus said to him, “Why do you call me good? No one is good except God alone. 20You know the commandments: ‘Do not commit adultery, Do not murder, Do not steal, Do not bear false witness, Honor your father and mother.’” 21And he said, “All these I have kept from my youth.” 22When Jesus heard this, he said to him, “One thing you still lack. Sell all that you have and distribute to the poor, and you will have treasure in heaven; and come, follow me.” 23But when he heard these things, he became very sad, for he was extremely rich.24Jesus, seeing that he had become sad, said, “How difficult it is for those who have wealth to enter the kingdom of God! 25For it is easier for a camel to go through the eye of a needle than for a rich person to enter the kingdom of God.” 26Those who heard it said, “Then who can be saved?” 27But he said, “What is impossible with man is possible with God.” 28And Peter said, “See, we have left our homes and followed you.” 29And he said to them, “Truly, I say to you, there is no one who has left house or wife or brothers or parents or children, for the sake of the kingdom of God, 30who will not receive many times more in this time, and in the age to come eternal life.”

is Jesus being "sarcastic" when he says this?  not likely, but that is one reason I've heard...that Jesus is perfect and no one else can be perfect, so he is saying this "sarcastically" because only the devil wants to be as perfect as Jesus.
can you be "good enough" as a person and still get into Heaven?  no, that's the entire point of this story...the rich man does good things, he follows the old commandments, but he would rather enjoy material goods on Earth instead of sacrificing his comfort for the benefit of others.
but...surely you can have your comfortable life and right before you die "confess" that you sinned and Jesus will forgive you.  sure.  Jesus will forgive those who honestly repent, but if you plan on being a sinner and "know" that Jesus will forgive you...that's not repenting.  and forgiveness doesn't equal a ticket into Heaven.  you can be forgiven and avoid hell, but there is another place for souls to go.
well, surely a savings account as a safety net is allowed...well...not really. Jesus tells his followers that God loves the birds in the trees and provides them their daily food, and God loves humans more than any beast he created, so there is no need to save money, God will provide your needs.
3.5 million homeless Americans...some people might not see themselves as "wealthy" because they only take a vacation every other year, and they only own three cars for the three drivers they have in their house, a house with two spare bedrooms...well, Jesus was homeless, he lived off of the kindness of strangers...so comparing your "wealth" to a millionaire isn't the right direction, you should compare your wealth to those that have nothing.  is it a sin to spend $5 on Starbucks coffee five says a week...well, based on everything I've read from Jesus, yeah, it most likely disappoints him that his followers don't follow the example and the message he left.

Luke 6

27“But I say to you who hear, Love your enemies, do good to those who hate you, 28bless those who curse you, pray for those who abuse you. 29To one who strikes you on the cheek, offer the other also, and from one who takes away your cloak do not withhold your tunic^b either. 30Give to everyone who begs from you, and from one who takes away your goods do not demand them back. 31And as you wish that others would do to you, do so to them.

32“If you love those who love you, what benefit is that to you? For even sinners love those who love them. 33And if you do good to those who do good to you, what benefit is that to you? For even sinners do the same. 34And if you lend to those from whom you expect to receive, what credit is that to you? Even sinners lend to sinners, to get back the same amount. 35But love your enemies, and do good, and lend, expecting nothing in return, and your reward will be great, and you will be sons of the Most High, for he is kind to the ungrateful and the evil. 36Be merciful, even as your Father is merciful.

Give to EVERYONE who begs from you.  If they want your coat, give them the shirt off your back too.  Give without expecting anything in return, give to the point it really hurts you.  Give up all these small comforts in life, because it is difficult...and then you will be worthy of calling yourself a Christian.  Saying you are Christian and showing up at church isn't being a Christian.  Fake Christians bother me.  A lot.  Those that wish violence on others, that want the death of their enemies are not true Christians.  Being a follower of Christ (which is what a Christian is) can be very, very difficult.  Failing is okay, but not trying is slapping Jesus in the face.

Luke 12

22And he said to his disciples, “Therefore I tell you, do not be anxious about your life, what you will eat, nor about your body, what you will put on. 23For life is more than food, and the body more than clothing. 24Consider the ravens: they neither sow nor reap, they have neither storehouse nor barn, and yet God feeds them. Of how much more value are you than the birds! 25And which of you by being anxious can add a single hour to his span of life?^c 26If then you are not able to do as small a thing as that, why are you anxious about the rest? 27Consider the lilies, how they grow: they neither toil nor spin,^d yet I tell you, even Solomon in all his glory was not arrayed like one of these. 28But if God so clothes the grass, which is alive in the field today, and tomorrow is thrown into the oven, how much more will he clothe you, O you of little faith! 29And do not seek what you are to eat and what you are to drink, nor be worried. 30For all the nations of the world seek after these things, and your Father knows that you need them. 31Instead, seek his^e kingdom, and these things will be added to you.

32“Fear not, little flock, for it is your Father’s good pleasure to give you the kingdom. 33Sell your possessions, and give to the needy. Provide yourselves with moneybags that do not grow old, with a treasure in the heavens that does not fail, where no thief approaches and no moth destroys. 34For where your treasure is, there will your heart be also.

Again...sell your possessions and give to the needy.  I have yet to find a passage where Jesus says, it's okay to spoil yourself with Earthly comforts, as long as you are decent enough a person.  He doesn't say, it's okay to give a tiny bit of your wealth and live your life in luxury, because a little bit of charity is good enough.  Most of the world lives in poverty, because of the greed based system we have in America.  Jesus doesn't say, it's every man for himself.  Nor does he say, he who dies with the most toys wins.  But that's the attitude of the average American.  Your life on Earth is NOTHING compared to an eternity in Heaven, and yet, most people who identify as Christian build up treasure on Earth, live a comfortable, wealthy lifestyle, and convince themselves that they are doing good enough by doing a small amount of good from their extra wealth, charity that doesn't come with personal sacrifice...where in the Gospels does it say that?  Several times Jesus says the exact opposite of that philosophy.
I am no longer Christian, but still a huge fan of the philosophy of Jesus.  I am one of those people who do little bits of charity when I can afford it...but I don't believe in Heaven or the afterlife...Christians do, and yet, the act as if they really don't believe in God, they don't believe in sacrificing their wealthy lives to benefit the needs of others...so they are going to the same afterlife I would be put into...not hell, but not Heaven either...I've challenged dozens of people all over the internet and haven't found one person who is willing to give up anything, not one who gave to me when I begged.  And to deny someone on Earth is to deny Jesus.
Matthew 25

31“When the Son of Man comes in his glory, and all the angels with him, then he will sit on his glorious throne. 32Before him will be gathered all the nations, and he will separate people one from another as a shepherd separates the sheep from the goats. 33And he will place the sheep on his right, but the goats on the left. 34Then the King will say to those on his right, ‘Come, you who are blessed by my Father, inherit the kingdom prepared for you from the foundation of the world. 35For I was hungry and you gave me food, I was thirsty and you gave me drink, I was a stranger and you welcomed me, 36I was naked and you clothed me, I was sick and you visited me, I was in prison and you came to me.’ 37Then the righteous will answer him, saying, ‘Lord, when did we see you hungry and feed you, or thirsty and give you drink? 38And when did we see you a stranger and welcome you, or naked and clothe you? 39And when did we see you sick or in prison and visit you?’ 40And the King will answer them, ‘Truly, I say to you, as you did it to one of the least of these my brothers,^f you did it to me.’

41“Then he will say to those on his left, ‘Depart from me, you cursed, into the eternal fire prepared for the devil and his angels. 42For I was hungry and you gave me no food, I was thirsty and you gave me no drink, 43I was a stranger and you did not welcome me, naked and you did not clothe me, sick and in prison and you did not visit me.’ 44Then they also will answer, saying, ‘Lord, when did we see you hungry or thirsty or a stranger or naked or sick or in prison, and did not minister to you?’45Then he will answer them, saying, ‘Truly, I say to you, as you did not do it to one of the least of these, you did not do it to me.’46And these will go away into eternal punishment, but the righteous into eternal life.”