I have been studying God's Word for more than 38 years and I have to say that Mr. Gaebelein's writings have been the most stimulating to date. I have many of the books that he references (for the good) and I really appreciate the simplicity with which he writes.
I am sure that all truth lovers will be blessed reading his books. We don't have to agree with every single thing that he says; that agreement comes only through God's Word; but God did send us teachers and I am so thankful for that.

I have just watched a video that says Schofield was taught by satanists who added pieces in the bible that aren't true. That Israel was meant to be a political, physical nation but the new testament says that Jesus kingdom is a heavenly kingdom not earthly one. (Galations)
That pieces were added about a rapture that weren't in other versions.

"I have just watched a video that says Schofield was taught by satanists who added pieces in the bible that aren't true."

Well we shouldn't believe everything we see on the internet - as Abraham Lincoln is reputed to have said in the well-known meme. 😊

Schofield didn't translate / re-translate the Bible - his reference Bible was like all others, ie, a standard translation (originally the KJV, now also available in other versions) with commentary included . No changes were made to the translation at all.

There is plenty of debate about whether Israel is distinct from the church, though Schofield isn't the originator of those views (and in fact you will find views on the restoration of Israel, as distinct from the church, in the English protestant tradition in 1600s / 1700s literature). I personally find Romans 9-11 impossible to interpret if one is to insist on the church being a replacement for Israel.

Btw, it is Scofield not Schofield 😊