You can't be serious.
If half your vendors stopped working with you because of the color of your skin, you really think that wouldn't have any negative effect on you at all?
The problem is that the objections are applied so selectively that it is difficult to take it seriously.
Do bakers routinely ask if the individuals getting married were adulterers, or engaged in pre-marital sex, or keep the Sabbath, or disrespect their parents, or commit blasphemy?
If the baker claims that blacks and whites should not associate, and cites religious reasons for doing so, is that now acceptable?
It's obvious that not only are the religious requirements applied inconsistently and in a discriminatory manner, but would also make a truck-sized loophole in anti-discrimination laws.
Yes, that's because
it is discrimination.
If a Marine walked into the bake shop and asked for a cake with a Marine (or a Muslim) holding an assault weapon and spraying bullets everywhere, should the baker refuse service and call the police?
Is there a long record of mass shooters buying celebratory cakes before they start a killing spree, that none of us know about?
Are Christians the only ones who can order cakes like these?