I assume the Bible is the basis of Judaism/ Christianity religion, and as I'm not religious I regard it as only a history book of the Jews ( old Testament ) and a history book of the rise of Christianity as a religion ( new Testament ).
Far as intelligent design is concerned, unless anyone can come up with some definitive, acceptable to all proof that God does not exist, it has to be accepted that God is possible. Given faith, it's not necessary to prove that God exists, and that's completely on topic ( -do-you-believe-in-god- ).
As for the why, I have posted my actual beliefs as to why I believe many times before, I won't be repeating them now.
Given my belief is about faith, I have no problem accepting that God exists ( but not as most anti God posters on here claim God to be ).