I do not use circular arguments. I believe in God because of the abundance of evidence, not the least of which is prophecy. Here's a question for you. If you got 40 people together and told them to write a book, two thirds of which was prophecy, each working on a different part, how do you think it would turn out? It would be a complete mess. Full of contradictions and errors. It would be humanly impossible. The Bible was written by roughly 40 different authors over a 1500 year period, and it is internally consistent with no errors or contradictions. Not only does it not contradict itself, it is 100 percent correct in everything it says. It has been proven through both historical records and archeology. The evidence is there.