The God of the Bible and Iroe

So... there's an often unspoken question that arises when creating a setting based on the real world. We are Christians, and believe God not only exists, but is fully sovereign over this world. God cares about this world deeply; He is not uncaring or apathetic to the troubles that befall it nor will He stop working in this world for His glory. Yet at the same time it would be very awkward to try and incorporate Christianity into a roleplaying game. How do you handle characters who aren't Christian interacting with those that are? How do Christian player characters not 'ruin the adventure' or otherwise hindering their party by stopping to evangelize instead of interacting with the plot. Furthermore, we have "gods" in this world; how do they relate to God?

Our solution is as follows.

• God exists, Jesus death on the cross happened, and those who have put their faith (i.e. trusting allegiance leading to submissive obedience) in Jesus they will be saved and resurrected at the end of days to live in perfect relationship with God, as we were originally intended.
• After the cataclysm at the end of the eighth world war, knowledge of Christianity was lost.
• God has not abandoned or given up on this world. In fact, He guided the radioactivity to cause evolutionary changes yielding new species instead of causing rampant death.
• Additionally, God converted much of the radiation to a new kind of energy: magical energy. Note that this magical energy is merely a force/energy source, not the kind of magic that Christians are warned against using (namely: magic relying on power from demons, as seen in Pharaoh's court for example).
• While knowledge of Christianity has died out, it is not completely gone. God has preserved copies of the Bible and Christian texts (and likely a remnant of faithful in an as-of-yet undiscovered LifeBiome, based on Isaiah and Romans) which will be discovered in the future (i.e. past whenever our campaigns take place) and will lead to a revival of the Christian faith, similar to the revival of the Jewish faith after the rediscovery of the Law in Nehemiah's day.