(This post may become my dumping ground for responses to that question. Have fun reading through it all if it does.)
After being prompted with a question as to what I believed and why, a need to answer that question anyway, and also the fact that I wanted to make a religious post, I felt like I had to start writing something on the subject. So here's a bunch of stuff about what it is that I believe and what I have to back it up. (I'll add more links later. So many more links to add.)
What it is: a religion centered on the belief that Jesus the Christ died and was resurrected for our sins. All you really need to do to get this gift from God is to ask for it. (Bible myth: Christ is a title, not a name. They didn't have last names in ancient times, that's a new thing.) It's based on Judaism, which is a pretty exclusive, primarily cultural, religion, and does fulfill it.
Why do I believe it: I mean for one it's nice to know you basically have a free pass to Heaven, if used wisely. It's not a "free pass" for sin, by the way. If you really think it is, you probably don't actually have the "pass" to heaven. There's also plenty of historical evidence to back the Bible up.
What it means: God is three persons put all into one. It's a confusing concept to try to wrap your head around, but that's OK. It doesn't have to make total sense just yet, so go with it.
Why do I believe it: there's biblical evidence for that. (This is one of those situations where biblical evidence is all that is needed to back it up, because it's a theological point.) For example, John 1:1 (KJV) says, "In the beginning was the Word [Jesus, as I have learned], and the Word was with God, and the Word was God." That's indisputable but people still want to argue it, so here it is.
The Second Coming: in the Future
What it is: Jesus Christ, you know, the guy who died and came back to life for our sins, coming back down to Earth.
Why do I believe it: John, in the Book of Revelations, tells us about this, as well as Jesus Himself (although he could be referring to his own resurrection, I'd like to debate this and figure it out). There is a time when Jesus will come again, and I'm not going to quote verses because someone's done that for me.
Why do I say "in the future?" It's because some people believe that Christ has already came back. I wanted to make it clear I'm not one of them.