Abdurrahman
You don't seem to have a firm grasp of what the Christian Theology teaches, what it means and what it stands for.
I hope this helps:
We believe in a God that is Pure, Just, Loving and Merciful; God knows no sin, and in order to be with God we must be 100% without sin. Even if we are 99% sinless, that 1% is still sin Abdurrahman; that 1% is an abomination to Yahweh and we can't be with him because that 1% would defile him.
So in order for us to reach 100% we must have attonement; when we accept the sacrafice of our savior Jesus Christ his blood attones for our sins.
We don't go to heaven because we have been good Abdurrahman, human righteousness are like filthy rags when compared to Gods righteousness. We are born in sin, in order for us to be with God we must be forgiven for EVERYTHING; it's the only way.
Muslims believe they can get to heaven when they have 51% of good on the scale, we christians do not; 51% is terrible, and 99.99% is still unworthy.
I hope this helps.