It's not hard for me to comprehend, my faith meant a lot to me for many years. I know that feeling you describe well.
Personally, I went in search of answers to the questions non-believers came at me with to reaffirm my faith. The more I looked, the more I realized that the arguments, cosmological, teleological and ontological were poorly represented by the religious. I found the arguments I had been raised to use suddenly seemed hollow and often all too easily refuted, I felt I had been cheated and misled.
I remember seeing William Lane Craig debate the first time, he really impressed me until I slowly went through his argument, yet again, what at first seemed impressive suddenly seems like a cheap card trick full of holes and intended to mislead and misdirect.
In many ways, I miss my faith but for me the curtain has been pulled away and there is no way I can go back and submit to suspend my credulity. My daughter is a bright young lass and when she asks me my opinion, I answer as honestly as I can but always remind her I could be wrong and she must weigh up all the evidence for herself, I could not imaging my parents or most religious parents doing the same.