The odd thing was that before God closed in on me, I was in fact offered what now appears a moment of wholly free choice. In a sense. I was going up Headington Hill on the top of a bus. Without words and (I think) almost without images, a fact about myself was somehow presented to me. I became aware that I was holding something at bay, or shutting something out. Or, if you like, that I was wearing some stiff clothing, like corsets, or even a suit of armor, as if I were a lobster. I felt myself being there and then, given a free choice. I could open the door or keep it shut; I could unbuckle the armor or keep it on. Neither choice was presented as a duty; no threat or promise was attached to either, though I knew that to open the door or to take off the corslet meant the incalculable.
(Excerpted from PBS site "Freud and Lewis")
The choice to acknowledge God or Heaven or Uber-Narnia is free.