You are correct in saying that #7, creating a court-system is indeed a "communal" requirement. "Christianity" is NOT idolatry "by definition", although some forms of Christianity, mostly Catholicism and certain Eastern branches, are considered Paganic and fall under the idolatry prohibition.

The only problem I see with your "alternate version of Pascal's wager" is from the POV of the other religions. Unlike the Noahide laws and Judaism, most any other religion "that respects itself" includes and exclusivity clause. ;-)