The Washington State Attorney General seems to think the state's consumer protection laws protect against discrimination based on, among other things, religion. I would go with his opinion, unless you can demonstrate otherwise.
I assume your second post is aimed at somebody else, but I'll comment anyway. The 14th amendment clearly applies to everybody. The choice available to civil servants is to not be civil servants. I also think this applies to any minister who signs marriage certificates. If they sign any, they needs to sign all of them.
Let me make myself plain. I am opposed to discrimination at all levels, for whatever reason. I am also, frankly very terrified off putting too much power into the hands of the government to control "thought crime." It starts us down a very slippery slope.
I don't think passing a law making bigotry illegal is the same thing as ending bigotry, people will just hide it. Twenty-five years ago, I believed that homosexuals deserved whatever they got. Now I'm paying for a lesbian wedding (which BTW I'm very glad is legal in the two States involved). Arriving at this change of opinion took a long time and a lot of soul searching. I'm quite sure the owner of Arlene's flowers will never change her mind on the subject, and certainly her treatment over the last two years will do nothing to encourage her to change her mind.
As they say, its easier to catch flies with honey.