Fay,

It would appear that replacement theology and antisemitism in the churches is rapidly spreading.

Is this because of a lack of sound doctrinal teaching, or by false doctrine being taught, or by "decoupling" from the old testament, or by popular influencer podcasters?

I would venture to say that all these things are happening with an increasing number of people and churches sadly affected by them.

I saw the following four articles, within only a few minutes, when looking at the news this morning.  four of them

https://allisraelnews.com/are-todays-jews-descended-from-the-khazars-empirical-evidence-negates-theory

https://rairfoundation.com/tucker-carlsons-chabad-conspiracy-theory-is-not-just/

https://harbingersdaily.com/the-israel-test-a-revealing-and-dividing-line-in-the-modern-church/

https://www.christianpost.com/voices/antisemitism-is-growing-in-the-church-something-has-gone-wrong.html