but tell me this if i suddenly decide to write a book just as he did why would you not read it or accept it. i'm not trying to make this look as a dumb question or offend christianity, but i simply want to know why would christians accept his book and not mine, because as far as i know he wasn't a prophet of god nor did he claim
Paul did not claim to be a prophet, but he did claim to be an apostle. A servant to God, a servant to Jesus, and I suppose the reason that his words are trusted is because of that, he claimed to be both a prophet, and claimed to be a servant of God. Jesus is believed to have given him "things to do".
Jesus later tells Paul,"...get up and stand on your feet, for I have appeared to you for this reason: to appoint you as my servant and as witness of this vision in which you have seen me, and of others in which I shall appear to you" (Acts 26:16).
Source:
Getting to Know Paul the Apostle 11:23GMT 2008-Nov-01
and two more question does the christian/catholic religion change these books (not the outside but the inside, the wording) as time progresses.
Only to make it "make sense" in the common day. For example, at one point "gay" meant "happy", but now it almost exclusively means homosexual. Idioms are gained, idioms are lost, etc. The message is still there, it's just the style that changes.
i mean there is the old testament and the new testament what do they really mean.
The Old Testament is "Pre-Jesus", for lack of a better term. The New Testament is from when Jesus is born, starts his ministry, and his followers'. Hope this helps.
finally if i wanted to become a christian/catholic then which book would i need to follow because these books aren't exactly the same word by word.
You would follow the whole Bible. You don't pick-and-choose.
because one of them says that before Jesus was crucified the roman guards came to his house and he jumped out of the window to escape them,
What Bible is this? What book of the Bible? I've never seen that!
another says that his friend (the one that betrayed him) took the romans to his house and told them who he was and the romans took him and i don't really what the other one says.
At his house? Which book of the Bible is this?
so which of these is telling the truth. which one am i to beleive.
I don't think you've quite got it right. As far as I'm aware, they both explain what happened more or less the same. Some with information left out, others with other information, but hardly THAT far apart as you said. Christians believe Jesus was in the Garden of Gethsemane when Judas showed the Roman guards who he was.