How does one exactly get into to heaven?
We're all sinners and have made ourselves enemies of God and guilty in His courtroom by breaking His laws.
That means that each one of us is deserving of Hell as our punishment.
The Bible tells us that God made us to fellowship with Him and to glorify Him, but that train jumped the tracks, so to speak, when we decided to rebel against Him.
In order to make a way that we might be forgiven for our sins and be reconciled to Him, to go from being children of wrath to children of God, Jesus Christ, the second person in the Triune Godhead, took on a human nature, came to Earth and dwelt among us, and paid the debt for our sin.
There is always a punishment and a payment for sin. In the Bible, this payment is made in the form of sacrifices.
Jesus, who knew no sin became the perfect sacrifice for our sin, so that whoever would repent of their sins and believe by faith that Jesus paid the sin-debt on the cross and was raised again on the third day, would be born again, forgiven and reconciled to God.
do you just have to live a good life and do good on earth?
No.
First of all, you can't live a good life. If you were capable of living a good life, then Jesus wouldn't have had to die.
Second, the idea of trying to appease God by living a good life is called "works-righteousness" and it's a recipe for spiritual disaster and, frankly, will make your life miserable.
There is a Greek myth about a man named Sisyphus who angered the gods and, as a part of his punishment, he was condemned to roll a big boulder up Mt. Olympus. The problem is that, every time he got near the top, the stone would roll all the way back to the bottom and he would have to start all over again.
Works righteousness is like that. You roll that stone of self righteousness up the hill, only to have it roll back down every time you sin.
It isn't enough just to try not to sin, the Bible tells us that we must be
dead to sin.
or do you have to become christian?
Even becoming a Christian will not save you. The Bible doesn't tell us to become Christians, it tells us to be born again.
There are a lot of Christians who will be in for a very rude awakening on judgement day because they were Christians, but were not born again.
So im basicly asking well god let me in heaven based on all the good characteristics about me?even though i continue to make dumb mistakes and choose to live a non-christian life?.
Let's say that a man is arrested for raping a woman and is hauled into court.
He stands before the judge and says, "But your honor, sure I raped that woman, but I did a lot of good things, too. And just think about all of the women I didn't rape!"
Now, if that judge is a just judge, he still has to punish you.
In the same way, no matter how many good things you do, you've still broken God's laws and God, being a just judge, must punish your sin.