You’re aware that, just for starters, 98M of the 185M total population of non-voters had the pretty rock solid excuse of not being eligible to vote, right? Almost a third of the country can’t vote (permanent residents, children, ex-cons in certain states, etc.) This is without needing to get into the very real voter suppression effort that took place (we’ll assume every one of those “stands” with the winner). These people may not be able to vote, but they’re still people, and able to participate in the political process in other ways, and thus not worth ignoring (for example, they can donate). They also probably skew more to your position given their demographics.

I am not sure why you insist on going out of your way to dramatically overrepresent the size of your opposition. If there’s some sort of underdog psychology you are trying to tap into, you should maybe also consider the possibility that staunchly presenting the current situation as “we’re outnumbered and most of our population stands with these abhorrent values” may actually be more demoralizing than invigorating as a battle cry, which is even more of a shame when it isn’t true.