Secularization was the effect, not the cause, in my case. In the era in which I grew up, the Church was quite adept at pointing out the problems in other Christian faiths. Serving my mission in TN and KY only expanded my knowledge in that area. When I finally had to admit to myself that I could no longer accept the truth claims of the Church, it wasn't long before I realized I couldn't even truly accept the notion that there was any such thing as a "true" church and that it was actually likely there is no such thing as the Divine.