to create fun video games and preach the gospel
Tough one. Without the preaching I would say, to honour God would be just to make a decent game and be decent about it. Like those workers that put detail in churches at places where no one would see it, but had the attitude that God sees it, so they did not kludge.
But preaching and fun is one of those oxymorons. One could of course make fun games with biblical topics, but those would probably not be preachy or educational in the way one would hope. Angels and other bibilical stuff is often used in games, and not in a way that churches would approve, I dare say.
If we can not have fun maths teaching games, religious games are doubly hard. Objectivly the religous stuff is awesome for story telling. But not in an educational way. People like to take stuff and retell it in their own way. That might make the whole topic popular, but twists it by doing so. There is a reason why fantasy gods and dead religions are popular for this; you cannot offend living members of their churches anymore.