Naturally, yes. But the fraternal nature of free association derives from the axiomatic position of mutual benefit within free enterprise. Doing business solely with members of your tribe is not necessarily doing business solely with those whom benefit you most. People are free to introduce purity tests, religious or otherwise, to their business decisions, but I fear this will only lead to infighting and witch trials. Joe Biden is a confirmed Catholic, for example. Many people don't even consider Catholics as Christians, let alone Biden.