Bob,
Here is my direct answer.

IF I knew that a SUBSTANTIAL portion of the take would go to support the church;
AND IF I knew that that church was HEAVILY into proselytising a viewpoint that I thought was toxic;
AND IF I knew that the performer was going to proselytise some of that religion;
THEN I would not go.

Note that ALL of the above would have to be true.
IF I knew that the performer was NOT an agent of the church;
OR if the church was NOT HEAVILY into proselytising a viewpoint that I thought was toxic;
OR I knew that a SUBSTANTIAL portion of the take would NOT go to support the church.

If any one of these was NOT true, I would go. I recognize that in some areas, this is not possible.

I recognize that in some areas, for SOME performers, this is not possible. However, I don't know of any musicians that I might want to hear who are active proselytisers. SO, I would likely go, especially if there were no other venues in the area.

I hope that directly answers your inquiry into my thoughts.

Saul