Perhaps the aim of this game is to undermine the claim "God made Adam and Eve, not Adam and Steve" by showing that the sentence remains true under any random combination of names in its second half, including those of 99.999999% of all heterosexual couples, and can therefore not be used as an argument against same-sex marriage. But surely, that is already to pay too much attention to something that doesn't even rise to status of an argument in the first place?
As a piece of communication, I think the game serves only to say "I'm not an extremist evangelical from the USA!". Good for you, but I don't think you need to make a game to communicate that. It comes too close to trolling.