From having spoken to them?
So if I talk to a few Catholic priests who tell me the priesthood is about molesting underage altar boys, should I then go out and claim that is how Catholic priests see the priesthood?
P.S.: I think you may be forgetting that "Hackers believe in God" can mean any of "All hackers believe in God," "Hackers tend to believe in God" or "There are hackers who believe in God." From the context, it seems most likely to me that the latter is the OP's intended usage.