Let Them Bake Cake (4/4): Third Unresolved Question

In the first post in this series, I offered an overview of the Supreme Court's ruling on Masterpiece bakery and its implications (or lack thereof).

In Part Two, I addressed the first of some unresolved questions that are sure to be hotly contested.

Part Three dealt almost entirely with the unresolved questions swirling around the political or legal side of the issue. 

Part Four will address this unresolved question: Is the argument of those who decline to participate for religious reasons a biblically solid argument? Are they actually complicit in sin by offering material aid to an event which they believe promotes and celebrates a moral ethic to which they are opposed?

I offer my thoughts not as a definitive answer, but as a reflection of where I am on this issue based on a lot of reading I have done and conversations I have had with other Christians who are at times significantly at odds with each other on how to respond. I welcome thoughtful critiques.