Faith/ Belief isn't knowledge... and it cannot disappear entirely so long as there is still one who believes, so long as you believe that there is still one 'other' who still believes. And so, in the presence of that one "still" believer, your faith gets restored. Like w/Thomas, your doubts only prevail in His absence.
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I remember a time when I had no faith, but I wanted to. I asked my mom if she could "feel" Him.
She said yes.