Two Realities – God and Satan
Just because someone does not believe in the reality of God, it does not make Him all of a sudden non-existent. God is real regardless if someone believes or not.
The reality we believe in is the one we partake in. The one we partake in is the one we obey. We should examine and see which reality is our master.
As I was writing this, the movie Matrix came to mind. The video below pretty much sums it up, as well as this verse –
2 Corinthians 4:16-18 Wherefore we faint not; but if indeed our outward man is consumed, yet the inward is renewed day by day. For our momentary [and] light affliction works for us in surpassing measure an eternal weight of glory; while we look not at the things that are seen, but at the things that are not seen; for the things that are seen [are] for a time, but those that are not seen eternal.