The sourcer/guilder would not likely have much relations with the church either way. He wouldn't be hostile, since his daughter needs their services (and as a merchant prince himself, he understands the need to charge for services). But he wouldn't be friendly either, because... well... they let his *wife* die. Justifiable or not, that's not the sort of thing you just forgive and forget. His attitude would likely be civil but somewhat cold, as in "I'll deal with you when I need to, but other than that we don't mix."
Not much room for alliances or opposition there.
As for the elf, the only kind of church he would truely support would be one with a predominately elven membership, which didn't mind his evicting non-elves to increase a province's magic rating. The insane druid thing would work for an independant ally, otherwise he would have a state-sponsered religion of his own along similair lines (probably through a cleric or druid vassal).
Other than things like that, he's not likely to be on good terms with *any* church. He acquires temple, law and guild holdings in his non-elven neighboors' territory in order to destabilize, divide and conquer. *Many* churches would have reason to oppose him, either because he's trying to muscle in on their territory or just on moral principle.