Science is now a full fledged religion. Much of its proselytising has been based on its not being a 'religion' at all. Science claims to be a rational, logical approach to investigating existence.
The early scientists, like the early christians before them were persecuted. Their teachings were demonised and their morality was considered suspect. Over time, the new way gradually replaced the old.
Science has heroes now. Hitchslap (now deceased) and Dawkins have been aggressively challenging priests in debate.
Over time, Christian priests became part of culture and government. Science has done very well in these areas.