That's painting a very strange brush against religious folks, which does not at all match my observations (religious people can very easily talk about all sorts

That's painting a very strange brush against religious folks, which does not at all match my observations (religious people can very easily talk about all sorts of things with other religious people (at least, those of vaguely similar religiosities), whereas conversations where at least one party is secular flicker and stagnate due to lack of known shared background)