[Serious]Why are you not a believer of the existence of God

[Lord Orwell]

The islamic faith only began in 700 AD. Loads of people seem to think it's older than Christianity but it's not. In fact it's an offshoot of Christianity. It doesn't recognise Jesus as the son of God but does recognise him as a prophet. It basically takes the view (and I'm simplifying here) that Mohammed came along 700 years later and corrected some of the miss-interpretations of existing teachings. In essence it's Christianity Plus or a biblical erratta.

It's worked so far

this all may be true but their bible is older than the new testament. It's a modified version of the Jewish bible and includes the exact same stories.