The reason they did that was not to denigrate religion or to promote indifferentism or any such thing, but to cast the widest net – to reach athiests or agnostics who would otherwise be put off by the program. And sadly, sometimes people need in the interim something, anyting to cling to before they can find God – think of St. Paul’s words: “I fed you with milk because you were not ready for solid food.” Geting somebody to believe in something, anything higher and greater than themselves, even if it is the chair they sit in at that meeting, is for the good and will lead them, God willing, to the one greatest good, God Himself.
BTW, one of the men that Bill W. consulted for aid with AA was a Jesuit priest, and there is a glowing recommendation from a Bishop, IIRC, in the Big Book.