XI/IX does seem to be a thing called the “chi-rho”, which was used in early Christian symbolism.

Were the two things ever commonly combined? Not that I’ve ever seen.

This method of thinking and wordplay does seem to bear fruit, and good fruit, but never the kind that can be proven to another person. Always only the kind that can be weighed, and either taken or left, completely up to the hearer/reader and their discernment.

Should have a little sticker that can be slapped on all such claims. “Sauce not Available”.

God-christ... consider the Gospel of John chapter 1:1-4...

In the beginning was the Word, and the Word was with God, and the Word was God.2 He was in the beginning with God. 3 All things were made through him, and without him was not any thing made that was made.4 In him was life, and the life was the light of men.

X is actually the Greek letter “chi.” Chi is the first letter in the word Χριστός (Christos ), which means “Christ.” X has been an acceptable shortening of the word “Christ” for nearly a thousand years, way before modern day Christians began taking offense at its use. In fact, The Greek letters “X” (Chi) and “p” (Rho) melded together was once a very common symbol signifying Christ and was called the Chi-Rho. The Chi-Rho was also used by scribes to mark a passage, implying that it was “good”.

You can see here Angel Gabriel represented with the letter "X" on his shield also Gabriel is considered as the messenger of God.