The gospels never really make a huge deal out of the belief in the apostles or God himself. Most of the congregational issues that the early Christian confronted were related to, first and foremost, wether Jesus was the promised Messiah or not, second, issues over allowed foods, third but not less, issues of immorality and loose conduct.
By far, the Christ was the biggest concern as it seems like they kept arguing with one another over what proof they had for or against him. This threatened the very basis of their faith, so the apostles had very little patient towards arguing over this matter. Wether you believe or not, there is a big parallel between that and the modern day GB, except that the GB today is not arguing wether Jesus was the Messiah. They argue their own authority and appointment, for as if you could convince anyone that 1914 is a hoax. among other things, they loose all authority.