I think this is an interesting point that is brought up:
"To Phillips,his claim that using his artistic skills to make an expressive statement, a wedding endorsement in his own voice and of his own creation, has a significant First Amendment speech component and implicates his deep and sincere religious beliefs."
This isn't really an angle that I thought about upon first hearing about this case. That being said (and without full knowledge of how this individual runs his bakery), I can't really agree that this is a valid argument, because I do not agree that baking a cake for someone constitutes a "wedding endorsement", unless the baker evaluates the strength and validity of the relationships of each couple he services. I cannot imagine that being a common practice among bakers...