Yes, it was the request. They wanted a custom cake celebrating a gay wedding, which was precluded by the baker's sincere religious belief.
If you read TFA I linked to, you would have read this as well as all the other insane requests refused, and that the baker was willing to sell otherwise made cakes.
This is a well litigated, well reported case and you have twice now insisted material elements of the case did not happen.
This is not about refusing someone based on their immutable attributes, but their requested content. Stop asking rhetorical questions regarding racism.