Bill Wilson obtained lots of A.A. ideas directly from Sam Shoemaker.
Some he got indirectly. But there was one message which came to Bill loud and clear and which he repeated in one way or another in every edition of the Big Book.
"One argument in religion is about as good as another, but an experience beats any argument."
In the BigBook, Bill speaks of the visit to him by his old friend, Ebby Thacher. Ebby had said to Bill, "I've got religion." Bill was musing about his own beliefs and about the futility of the religions of mankind.