How you feel about Christians isn't entirely the point here. I was raised Catholic. I haven't gone to church in years and consider myself a "recovered" Catholic, but nonetheless, I still have a sense of common decency. Those people have no business performing at that stadium and I can't understand why many in the LGBT community wouldn't also speak out against it. These people do NOT represent mainstream LGBT people. These performances are repulsive and without question belong in the adult category. They do not belong at a baseball game. My younger sister is homosexual and I know she would not be okay with this.
If the point of the Dodgers organization is to portray the LGBT community as vulgar, sexually depraved lunatics then they're doing a bang up job of it. Do you really think they are going to gain more support from that small fraction of the population than they will be alienating?