I think what is going to happen is that Christian bakers, photographers etc have to stop doing weddings period.
Then there might be a mechanism where the orders come through certain Christian churches where there is a pre-existing arrangement regarding whether the weddings are going to be within the bounds of Scripture.
Another possibility is that there might be a new business of “Christian Wedding Coordinator,” where the coordinator only does Christian religious weddings, and then they refer services out to bakers, photographers on a list.
Or keep it to those who are Christians what you have posted.