marichiko, being baptized has nothing to do with being saved. It's a public ritual that shows others that you have accepted Christ. Original sin is the natural state of humanity, and has nothing to do with the fact that you were conceived via sex.
Only a handful of sects believe that all the members of the others are going to hell. If you believe Jesus is the son of God and that his death pays for your sin, you're a Christian.
When you start getting humans monkeying around with the original message, that's where trouble starts. Catholics say you have to go through a priest to talk to God. Mormons say that God is just a man who's reached a higher plane of existence. Lutherans sprinkle, Baptists dunk, Assembly of God gets hung up on prophecy, faith healing, and speaking in tongues. Some of that stuff is not critical to what they believe re: Christ and salvation. Some of it is. But belonging to one denomination or the other isn't what defines your relationship with God. Being "a good Catholic" is not the same thing as following Christ, although millions use it as a substitute. One branch of the Church of Christ doesn't allow musical instruments in church, and doesn't allow women to wear pants. That has nothing to do with the message of Christ.
There are a lot of people who were raised in religion, but never got around to the actual point of Christ. Religion is a minefield of bad doctrine, legalistic but empty regulations, and self-proclaimed experts. That's what happens whenever you get a bunch of people together -- they want to organize things and micromanage each other.
It's not about religion though. It's about the message of Christ. People should examine what Christ said and did, and decide his validity based on that alone, not on the actions of a bunch of flawed men and women. Christianity is a personal experience. Fellowship and friendship with other Christians is how we strengthen our own faith, hold each other accountable, and help each other through tough times. Unfortunately, "religion" often results.
Flint -- I don't think that the concept of the trinity and the concept of ID have much of anything to do with one another. I'm not much of a biblical scholar, but I think the whole trinity thing is from Catholicism. I'm not convinced that it's anywhere in scripture. I realize you're not really asking, just taking shots, but you should know that it's possible that if there is a God, he might be smarter than you. He might even be capable of doing things that you can't explain. Just saying.