Since he wants to tear down religion, possibly he is an atheist. That seems to be what some of them want.
I use the term “secular humanists” for those who wish to undermine religion.
Some atheists do this as well, but I also know a fair amount of atheists and agnostics who simply do not know God. They don’t understand the concept and they don’t, as a matter of practice, try to tear down or undermine the beliefs of others.