The Bible (according to my tradition, YMMV) teaches that you are irrevocably saved at the moment of belief. Baptism is the next step to take as a demonstration of your belief. God is not autistic. He knows when you're for real. John 3:16 makes it very clear that belief is the gate. Baptism is more of a firstfruit.
The sacrament of baptism ought to be administered by someone who has been baptized. Just go get baptized when you have a chance. These days, it's usually a bit of a hassle, as you'll have to coordinate around whomever is baptizing you.
This is doctrinally incorrect. Because it countermands Christs command in John, Chapter 8 verses 10 and 11 where he pardons the prostitute.
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10] When Jesus had lifted up himself, and saw none but the woman, he said unto her, Woman, where are those thine accusers? hath no man condemned thee?
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11] She said, No man, Lord. And Jesus said unto her, Neither do I condemn thee: go, and sin no more.
Christ offers a pardon, but he does not offer a blanket pardon into the future. A Christian must be mindful of their fallen nature going foreword and strive every day to follow Gods law. If they should fall short for whatever reason, they must own up to their failings through prayer. This is what eventually led to the Catholic Confessional system, though I would argue that is not strictly necessary, especially if you are protestant and follow in the "personal relationship" doctrine. Owning up to your failings through prayer works just as well, as is actually striving to not do the thing again.
Its not enough to say, cheat on your wife, pray about it, and then go and do it again next week. The state of grace is one of constant maintenance, and is why its often referred to as walking "the straight and narrow", where a single deviation off the path leads to damnation.
If you are interested in a theological dissertation on the subject, this excerpt from Augustine's "retractions" would be very illuminating.
