It would not be a lot. It would fade into the background, except that any time you want to see beauty you just have to look up and focus.
i highly doubt a christian church has the same effect. everytime i see a church i think about atrocities commited by the religion and alienation
Maybe not the exact same effect as nature but it is indeed calming to me at least. Stepping into a cathedral, or masjid, or temple and the noise of the world falls away (and I'm not even religious). I'm sure I'm not the only one.
Not to downplay atrocities committed in the name of Christianity but I am pretty sure every large ideology has its share of of atrocities.