If people form a common group identity, in concert with feeling threatened by people outside of the group, they will find *some* way to form a body of ideology and a subculture which serves to respond to outsiders with violence and oppression.
New Atheism formed a group identity that centered "Western Culture" (read: whiteness) and accrued more and more trappings of right wing ideology over time. Eventually, many of its proponents embraced the rest of the right wing.