Homophobes and the Klan are not protected classes.
Should a Muslim caterer be required by law to provide pork for a secular event?
If they do not provide pork to anyone else under any circumstances then they can't be compelled to provide it to a secular event.
Should a Jewish photographer be required to shoot a wedding on the Sabbath?
If they don't do any other work on the Sabbath then no.
The answer to all these questions is: Of course not. Why, then, should a Christian baker be required by law to design a cake celebrating the “wedding” of two women (or men)?
Because denying services based on sexual orientation is a crime in Colorado. Change the law.
That’s what’s known as a straw man. This isn’t about denying services to homosexuals which are afforded to normal people. This is about forcing Christians to affirm a practice, and engage in celebrating a practice, which violates the Christians’ personally held religious faith.
I am truly not surprised to find you opposing natural law rights such as those articulated in our bill of rights. Forced association is a denial of "freedom of association."