BibleHub's Greek section says that the Greek ἀμήν is a transliteration of the Hebrew amen (such as is found at Num 5:22 and pronounced similarly).
I kind of doubt that the God of Numbers, who ordered the destruction of everything pagan in the promised land, would agree with your derivation of the word.
OTOH, unless one takes his saying "amen" to others prayers seriously, I could see it becoming a part of mind control, where one might automatically assent to things he might not otherwise have agreed to.