Do conservative believe in a separation of church and state?

I mean the pilgrims came to the Americas fleeing religious persecution, and one of the main tenants our democracy was founded on was a separation of church and state. Yet I see conservatives supporting things based on their religious views. Not supporting gay marriage, or abortion, or thinking creationism should be taught in public schools instead of evolution.

Is it just that the majority religion is Christianity so you feel you should be allowed to turn your views into legislation? Islam is the fastest growing religion world wide. What happens when in fifty years Islam is the majority religion in the USA and they start lobbying our representatives to pass legislation that aligns with their core beliefs?