What is the issur of supporting avodah zara? We are afraid that your business will cause them to be thankful to their god. An issur of lifney iver.
Subject to all of the gedarim of lifney iver.
however, I believe we rely on tosfos in chullin & places in avodah zara that today people are not really dedicated to their various gods.
and goyim are not forbidden from shituf l’halacha (machlokes rambam tosfos, see yechaveh daas chelek 6/60) ( god+man) and trinity would got into that catergory.
so I think you’re good.
top of head, subject to fabrication 🙂
and look both ways before you cross the street