"Protestants also tried to impose their own bigotry but lacked sufficient coordination and authority. Had they been more effective, modern science and sustained economic growth might have never taken off."

That's an interesting take. It seems to have a continental Europe perspective. In the first 150 years of the American colonies, Catholicism was illegal, except for Pennsylvania. However, even there, Catholics remained disenfranchised. The first Catholic university in the US, Georgetown, opened in 1789. (Harvard: 1636, Yale: 1701). The first amendment was ratified in 1791 (meaning Catholicism could no longer be made illegal). Catholics were mostly unwelcome to attend other schools, that was the reason for divergence and almost certainly assured a high nepotism rate. Also note that in the 1700's/1800's nepotism in government was considered normal.