What do you think about peaceful coexistence between those who study our material world (scientists) and those who study our spiritual world (theologians)?
If by "peaceful coexistence" you mean that they should stop disagreeing with one another, then I would point out that there is no peaceful coexistence between theologians and other theologians; and that any professional godbotherer who suggests that religious folks should stop spouting antiscientific nonsense will inevitably be denounced by a large proportion of his coreligionists as a godless tool of Satan.
Is it possible?
Not in the forseeable future.
Is it desirable?
Perhaps. But then again it might hasten the decline of religion if it was as silly as possible; and that prospect also has its attractions.
What should we do promote it?
"Kill them all. God will recognize his own."