I don’t see a big issue with a band. They are not performing a religious wedding ceremony. In fact, I venture to say that a lot of Bar and Bat Mitzvahs have DJs and bands that are not Jewish. Lots of weddings have music vendors of different belief systems than the couple who is celebrating. Even those in attendance at a celebration don’t necessarily have the same religion, race, or sexual orientation. I have no problem attending a Muslim wedding even though I am Jewish. If I am a vendor of wedding supplies, I would not care the race, religion, or sexual orientation to whom I sell my products or services. I am not supporting or condoning their beliefs or practices. I am merely doing my job and providing what they paid me to provide. I certainly would not want all businesses to decide who can buy their products or services based on race, religion, or sexual orientation.
Nobody is being forced to worship or change their beliefs or orientation. They just have to abide by non-discrimination laws, and be tolerant and accepting of differences. Our country is based on these principles are so are the laws. The country still has a way to go. But that baker in the original article and some on this thread seem to want to set us backwards. Nothing positive can come from intolerance and discrimination. It just causes more problems.