You’re going to have to eliminate first past the post for that to work. Both parties are essentially coallitions. Christian nationalists and big business, and their apologists on one side, and everyone else on the other.
An election is fundamentally binary: it has one winner and everyone else is equally a loser. There are other structures that don't fall prey to that, such as multi member districts or party lists. As long as the election has a unique outcome, everyone else is equivalently irrelevant.