Making a game is lot of work and could need a lot of funds to complete something like this.

Also, I am not sure it will earn enough amount with Google Ads if it is educational game that gives rewards from ads that these same users should be clicking. It would need to go viral to earn from CPI/CPM or users would need to actually engage with the ads to earn with CPC or CPA, but if users are on the site to earn rewards then it's most likely not gonna happen.

But I could see a potential in it to spread awareness in Christian community if there is already some game like that, which has progress/achievements and has means to reward users for their progress with attestation bot (rewards from distribution fund).