That you're thinking this through in itself hardly indicates someone condemned to hell I think. It sounds like you're a calvinist who believes you have no choice but to follow God. To believe and do right takes a choice. I disagree with calvinists on this fatalist stuff. I will just point out though that questioning one's faith is actually Biblically commanded and encouraged.
1 Corinthians 10:12 Wherefore let him that thinketh he standeth take heed lest he fall.
1 Corinthians 11:28 But let a man examine himself, and so let him eat of that bread, and drink of that cup.
2 Corinthians 13:5 Examine yourselves, whether ye be in the faith; prove your own selves. Know ye not your own selves, how that Jesus Christ is in you, except ye be reprobates?
Even if someone were to err from belief in Christ, there wouldn't be definite cause for fatalism.
James 5:19 Brethren, if any of you do err from the truth, and one convert him;
20 Let him know, that he which converteth the sinner from the error of his way shall save a soul from death, and shall hide a multitude of sins.
Loving God and loving others as ourselves are the two great commandments, and love covers a multitude of sins.
1 Peter 4:8 And above all things have fervent charity among yourselves: for charity shall cover the multitude of sins.
Matthew 22:37 Jesus said unto him, Thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thy mind.
38 This is the first and great commandment.
39 And the second is like unto it, Thou shalt love thy neighbour as thyself.
40 On these two commandments hang all the law and the prophets.