I don't feel any need to register or react to it.

It's a traditional coda to a prayer although originally meant to be a response of agreement (it's derived ultimately from Greek and means "truth" or "certainty" so it's just an ancient way of saying "word!" or "true, dat!"

I see that this etymology differs from the one cited by @DavidLaDeau which goes back another couple of levels to the Egyptian via the Hebrew; it appears to be sort of studiously ignored in some references, particularly the Egyptian part, which might be a little speculative for all I know. But if true, that does peg the irony meter.

"Amen" just means, "I agree."

It's an ancient word, from Hebrew, Arabic, and early Afroasiatic languages, incorporated into Greek.

I sit in silence. I don't buy in, but I am happy to respect what they feel they need to do.

I usually chuckle. It is true in Hebrew it does mean "So be it," the interesting thing is that the origin of the Hebrew word is thought to come from the Egyptian "Amon." Or also spelled Amun. Amun was a combined with the deity Ra. These were from the upper and lower kingdoms of Egypt.
When the Egyptians ended their prayers they Honored Amon with his name. This became Amen with the Hebrews, Thus the Hebrews actually ended their prayers honoring the Egyptian God. No kidding. So when Christians end their prayers with Amen they are actually Honoring an Egyptian God. I am not kidding here.
So I just chuckle.

it just means "so be it." people say it at the end of prayers but it can be said any time you wish something to happen, and it's not necessarily a CALL for something to be, any more than "i sure hope so" would be.

g

i do nothing. it doesn't have to be a religious word, actually.

g