[Joeiss]

"If I save a busload of childrens lives, I wont go to heaven because i didnt do it for God?"

No. If you are a non-believer, you will not go to heaven. If you believe in God, you will.

If you are a non believer, you still did a great thing, but it is meaningless. Christians live their lives to go to heaven for eternity. I am not sure if you understand that. So everything that we do should be done for our faith.