Plausibility Check: Ditheism overtaking Monotheism?

Gender-neutral God. Though the "He" is used because of the lack of a singular neutral personal pronoun, God is gender neutral in Christian theology. Obviously, Jesus was incarnated as a man, but can you imagine, given the OTL persecution of Christians, the persecution of a religion led by a WOMAN? Even God has practical concerns.
 
God is gender neutral in Christian theology

For the Holy Spirit maybe (was it refered to as "He" in the err...Greek/Aramaic whichever language during when the Scriptures were written?), but God the Father and God the Son is hardly gender-neutral.
 
For the Holy Spirit maybe (was it refered to as "He" in the err...Greek/Aramaic whichever language during when the Scriptures were written?), but God the Father and God the Son is hardly gender-neutral.

IIRC, the Holy Spirit is never given any gender identifiers. I do know the average Christian sees the Holy Spirit as an "it" in a way separate from how they regard God the Father or God the Son.
 
Perhaps have Gnostic Christianity become the dominant faith in Europe.

Whilst not strictly Ditheism (there are strictly speaking multiple gods and one supreme god that is more like A supreme Hindu god) I could see a more popular version having a greater emphasis on the relationship between Christ and Sophia.

No idea how you would do that. I mean Gnosticism is hard to relate to for many and by its nature it is arguably elitist, certainly anti materialist to an extreme.
 
Perhaps have Gnostic Christianity become the dominant faith in Europe.

Whilst not strictly Ditheism (there are strictly speaking multiple gods and one supreme god that is more like A supreme Hindu god) I could see a more popular version having a greater emphasis on the relationship between Christ and Sophia.

No idea how you would do that. I mean Gnosticism is hard to relate to for many and by its nature it is arguably elitist, certainly anti materialist to an extreme.

The problem with Gnostism is that it would have been more like to use hindo-buddhism as a comparaison, A Deva YHVH VS An Ashura FALSE YHVH... Dualism and manicheism of sort, light and darkness, truth and false, not male and female..
 
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