I have often said that I am glad I grew up Mormon, else I might never have figured out that Christianity and the theology in the Bible is not true.
I don't know that I would have investigated the true history of Biblical theology if I had not first had to investigate the true history of the Book of Abraham.
I don't know that I would have ever questioned what I believed were promptings from God or that I communicated with God in my prayers, if I had not first had to question the "promptings I had received from God" that Mormonism was true.
I might have never questioned divine miracles, if I had not had to question priesthood healings.
I might have never had second thoughts about the intense love I felt from God, if I had not learned that those same feelings indicate nothing and are almost certainly created by our own brains.
Mormonism has proven to be a great stepping stone to teach me to investigate thoroughly and critically religion. I am happy with where I am now, and I am not sure I would have gotten here had I not been raised Mormon.