You are exactly right that Christian morality boils down to "might makes right".

But when you say that they've got it backwards, that implies that secular morality does not also rely on "might makes right". And I think that is incorrect.

In fact, all "morality" simply comes down to power and preference, as I think I've done a very thorough job in explaining here: https://medium.com/the-panopticon-publication/morality-is-personal-and-tribal-always-20c8c31f5d29

Once a majority of people recognize this, then we'll be able to finally have sane conversations about how to live together, that aren't simply people yelling at each other about who should be more ashamed of their incorrect morality.