That's a rationalization based on stereotypes, not a necessity.Because believing in God has been the social norm for 2000-ish years for no good reason, plus the negativity associated with religious fundamentalism, as well as the general pursuit of knowledge.
the last one is the only real reason; the rest are really excuses to question his existence
(don't tell the others I said that, it's an atheist secret!!!)
So how does the pursuit of knowledge exclusively exclude the possible existence of God? From the misuse of religion by groups and individuals I understand but science has also been misused is such a manner so the real question remains.... why is it a necessity for some? I'm sure I know the answer from a psychological and sociological aspect, but most people don't want to know, they consider themselves above common human failings and don't like hearing that they aren't. Yup the social sciences are my bailiwick.