WilfSelf - if a Christian couple have a clearly-stated policy (derived from a moral code that informs their decision) regarding who to accommodate or who to turn away, I feel that should be respected or, at the very least, tolerated.
If their so doing harms their business - through loss of business or reputation, then so be it.
But for the Law of the Land to force them to accomodate in a way that runs contrary to their (not outlandish or extreme) beliefs is heavy-handed and excessive, in my view.
For them (and for their supporters) to be personally abused by those (preaching tolerance) that disagree with them is ironic and somewhat counter-intuitive.