"if I willingly walk into a church am not I giving tacit approval to that church's activities?"

Your personal threshold is the one that counts in making your choices. I dislike purchasing dog food at a particular large chain, but when the manufacturer went through last year re-branding there were supply problems at smaller retailers--the manufacturer was taking care of the "best" wholesale customer first, much to the annoyance of this retail customer. But rather than risk the output that can result from sudden diet changes, I bought from the big retailer I dislike.

You'd have to tell me, did I give tacit approval to that location or chain? My personal threshold prioritized feeding the dogs with consistent food over being careful to "vote with my money." Similarly, as has been said many ways, you have to prioritize your wish to support particular performers (including or excluding their choice of venue) in relation to your views about churches and/or religious organizations. Your choice whether you do so case by case or with a blanket decision with[out] exceptions.