Status of nikaah if one of the spouses visits a temple

Q: If from a married Muslim couple, either the husband or the wife visits a temple or any other non-Muslim shirk place to seek cure for a certain disease which they do on others. What is the status of their nikaah?

I have seen Muslim men and women enter temples to get cured from chicken pox and I was even advised by an ignorant person to go to a particular temple and say something, but I did not commit that major shirk.

Dropshipping

Q: I'm pretty sure you are aware of how dropshipping works, where someone buys from another person who actually buys from another wholesaler, etc.

So my question is that, would dropshipping be permissible if in the advertisement the following things are stated:

- Time and duration of delivery

- That the actual seller does not have possession of the item

- A thorough description of the item