It will just have to be Christians opening certain businesses and refusing to carry certain items, I imagine a Christian drugstore owner could refuse to carry abortion pills?
No, I think the Supreme Court essentially ruled that all pharmacies must carry contraceptives yesterday, as weird as that seems.
Likewise with bakers, B&B's that host events, etc.
To a lot of businesses weddings are what keeps them going through otherwise lean times.
And as far as running a pharmacy that just doesn't stock certain drugs, I'm thinking you'll have problems with the distributors and drug companies. If you don't sell Product X then they won't sell you Product Y, etc.