Memory is... similar to anticipation: an instrument of simplification and selection.
I never wavered in my certainty that God did not exist. I was simply liberated by the thought that there might be a way to engage with religion without having to subscribe to its supernatural content - a way, to put it in more abstract terms, to think about Fathers without upsetting my respectful memory of my own father. I recognized that my continuing resistance to theories of an afterlife or of heavenly residents was no justification for giving up on the music, buildings, prayers, rituals, feasts, shrines, pilgrimages, communal meals and illustrated manuscripts of the faiths.
The inability to live in the present lies in the fear of leaving the sheltered position of anticipation or memory, and so of admitting that this is the only life that one is ever likely (heavenly intervention aside) to live.