I think the relationship between religion and reason has been largely about control of knowledge.
There might well have been scientific study springing from religious institutions, but in general, the church chose what you should believe.
Science was never dependent on religion, but religion used knowledge or the pretension of wisdom as power.
Moral codes change subtly with each generation. Conservatism attempts to preserve our heritage of morality which has been projected through Christianity.
Christianity is not necessary in order to uphold the codes which make for a decent, civilised society.
What is necessary is to reject other codes, or lack of them, that threaten it. That doesn't mean defeating other religious beliefs, but simply preserving the code that has served us for ourselves.
In practical terms, that threat is carried by demographics and related migration, with the rise of the World Wide Web spreading ideas faster than ever before. This is where the battle to preserve our way of life is.
I'm sure we can both agree on that.