The idea of using 'memes' in the spiritual and culture war is a good one - so long as the aim is to change thinking rather than to impact mainstream mass and social media.
And, if we agree that the best or only hope is a mass and leaderless awakening, then any effective meme needs to work at an individual level with implications, as well as implying some kind of social consequences.
From that respect the 'Deus Vult' (God will it) crusader meme is useless in a world where the mainstream Christian churches are corrupt and converged - since it implies an already existing army-for-God which we might join.
Or 'MAGA' (Make America Great Again) is hopeless; because the USA is (here, now) profoundly divided about what it is; and Greatness is a weasel word that includes lots of bad, indeed terminally destructive, things. It also leaves-out all reference, even implicit, to 'the one thing needful'.
So, both of these fail to begin with an individual, and they make 'action' a matter of subscribing to some organisation or institution - in a world where it is exactly these groups that are leading us to damnation.
A failed Christian meme from a few decades ago, but persisting a long while, was: "Jesus Loves You". On the positive side is the word 'is' - which is the main point of it. Jesus 'is', not just 'was'; and another positive feature is 'You'-personally - it invites a personal relationship.
Of course, the effect faded and the phrase became empty (and the concept of Love was swiftly and very fully subverted - with the help of The Beatles and much of mainstream pop music and culture); but perhaps Jesus Loved You helped fuel that small but real evangelical Christian revival among youth of the late sixties, early seventies...
My understanding is that the root of our Big Problem is our metaphysical assumptions about reality; which have eliminated any possibility of meaning, purpose, or a personal relation with the world. So memes ought to address these. Then, if they were effective, people would recover their motivation and courage.
The kind of thing that is needed is something - not exactly but along-the-lines-of - "The world is alive, the world is beings."
Or: "Your soul is divine, your soul is free - so choose."
Or, the syllogism-like slogan: "Jesus is God, Jesus is a Man - Man may be god."
Or: "If you want everlasting life: follow Jesus."
That is the level, that is the brevity and simplicity; the trick is the meme's pregnancy... the capacity to take-root, inspire, en-courage, unfold in the desired direction.