Hi there, MeriPie, and welcome to the Chrons.
So far as location is concerned, yes I think I'd take it away from the Vatican City if at all possible. Whether you go for another important Christian site (not sure if Canterbury has the same sort of glamour attaching to it, somehow...) or one from another religion, or even make up one of your own depends a lot on how confident you feel about writing about places you haven't been/seen -- presumably not all the action will take place in mysterious crypts and deserted cloisters? Also think about the cult -- if the businessmen have come straight from their offices, the shrine is unlikely to be deep in the Black Forest. On the other hand, if the worship involves sand, you might want them in the Sahara. Play around with it and have fun.
Re the language thing, if you're writing in first person, then he can call it what he wants. You can always have some busybody tell him that's not what the 'Gift of Tongues' means, or he can do his own research. Personally, I think I'd probably carry on as you have been doing, ie not calling it anything in particular, or at most something like 'my talent' or 'my gift', or perhaps 'my curse' if he doesn't like the problems which come with it.
Hope that helps
So far as location is concerned, yes I think I'd take it away from the Vatican City if at all possible. Whether you go for another important Christian site (not sure if Canterbury has the same sort of glamour attaching to it, somehow...) or one from another religion, or even make up one of your own depends a lot on how confident you feel about writing about places you haven't been/seen -- presumably not all the action will take place in mysterious crypts and deserted cloisters? Also think about the cult -- if the businessmen have come straight from their offices, the shrine is unlikely to be deep in the Black Forest. On the other hand, if the worship involves sand, you might want them in the Sahara. Play around with it and have fun.
Re the language thing, if you're writing in first person, then he can call it what he wants. You can always have some busybody tell him that's not what the 'Gift of Tongues' means, or he can do his own research. Personally, I think I'd probably carry on as you have been doing, ie not calling it anything in particular, or at most something like 'my talent' or 'my gift', or perhaps 'my curse' if he doesn't like the problems which come with it.
Hope that helps