There is a simple solution to the whole wedding issue ["Christians make pre-emptive strike against 'gay' weddings"].
If you go to a bookstore, there are a set number of book choices. I cannot buy a book a bookstore does not sell. A Christian video vendor just needs to create a set of intro chapters in their products they always include with all customers. "In the beginning God created the heavens and the earth. On the sixth day God created man and woman, and they were joined. Today you are joined. This is your story."
They don't deny doing a gay wedding. It's just that all of the product choices would include Bible verses. They can be generic Bible verses that don't talk about gay marriage, so it cannot be viewed as anti-gay ... just pro-God.
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A flower person can do the same: All flower bouquets have decorations in them that include Bible verses. Just include general ones that don't talk about gay marriage.
Is a bookstore required by law to sell a blank book, a journal? No, it is a product choice that some bookstores sell and others do not.