People say that its irrational not to believe or pray to God, yet we never see him or hear from him.
You can see God in all the creations he has made and hear him in his word, through the mouths of others, and by answered prayer.
Pretty much, from a Protestant, you are expected to believe Jesus died for you, and that you believe in God.
James 2:
20But wilt thou know, O vain man, that faith without works is dead?
21Was not Abraham our father justified by works, when he had offered Isaac his son upon the altar?
22Seest thou how faith wrought with his works, and by works was faith made perfect?
23And the scripture was fulfilled which saith, Abraham believed God, and it was imputed unto him for righteousness: and he was called the Friend of God.
24Ye see then how that by works a man is justified, and not by faith only.
25Likewise also was not Rahab the harlot justified by works, when she had received the messengers, and had sent them out another way?
26For as the body without the spirit is dead, so faith without works is dead also.
Nowhere in the Bible does it say that you will go to Hell if you don't believe in the Christian God, and nowhere does it say you will go to heaven if you're Christian.
John 14:
1Let not your heart be troubled: ye believe in God, believe also in me.
2In my Father's house are many mansions: if it were not so, I would have told you. I go to prepare a place for you.
3And if I go and prepare a place for you, I will come again, and receive you unto myself; that where I am, there ye may be also.
4And whither I go ye know, and the way ye know.
5Thomas saith unto him, Lord, we know not whither thou goest; and how can we know the way?
6Jesus saith unto him, I am the way, the truth, and the life: no man cometh unto the Father, but by me.
7If ye had known me, ye should have known my Father also: and from henceforth ye know him, and have seen him.
