First, the second website that fine points us to doesn't always know what it's talking about:
The fact that "Amen" came from Jewish sources into Christianity is acknowledged in the Catholic Encyclopedia Vol. 1 1907
"The word Amen is one of a small number of Hebrew words which have been imported unchanged into the liturgy of the Church ... 'So frequent was this Hebrew word in the mouth of Our Saviour', observes the catechism of the Council of Trent, "that it pleased the Holy Ghost to have it perpetuated in the Church of God."
It is ironical that the Holy Ghost (spiritual form of God) would ask to implement something after hearing it from The Saviour (Jesus Christ)!
Do you see anything in the Catholic Encyclopedia quote saying that teh Holy Spirit "asks" anything? How did that fellow read that into it?
Very sloppy scholarship.
Nothing like a false etymology to confirm a bias, right?
In fact, you and Strong's are right. The word "amen" in it's different forms is a quite common Hebrew word:
Esther 2:7 (translated, "brought up" in NIV)
Numbers 11:12 (transl. "carry them")
Ruth 4:16 ("cared for him")
2 Kings 18:16 ("doorposts")
2 Samuel 20:19 ("faithful ones")
Isaiah 22:25 ("firm place")
And a whole host of other places:
1 Chron. 17:24
2 Sam. 7:16
1 Sam. 2:35; 3:20
and so it goes.
It is a common word for making something sure, certain, or secure. As used at the end of a Hebrew prayer, it could mean something like, "Absolutely," or "May it be so."
Pagan deity, indeed.
Fine, when it comes to what might support your biases, you are entirely too credulous.