When writing fiction we're told to not ask the audience to believe more than one impossible thing at a time ..

Question

... so how does religion manage to sell itself?

Answer 1

Simple, as Mark Twain said, "Truth is stranger than fiction."

Human reason is the spark of the divine within us. It is our capacity to know the truth of things.

One thing that make us human is our ability to think our way through to convictions (or strong beliefs). So reason and faith cannot be in conflict.

True faith
+ Is reasonable faith
+ Makes sense
+ Can be proposed as reasonable to others

With love in Christ.