I have yet to see a theological argument prove the incompatibility of Dispensationalism and Calvinism.
Not trying to convince anyone to go "dispy" here,
but I do think it's good to share knowledge so people can say "Oh, I know what those guys believe" without misrepresenting the other side.
As I typically say: I'd rather be disliked for who I am than for something I'm not.
Whether coincidence or what have you, we did just address the primary differences, here's the FFF thread:
https://www.fundamentalforums.org/t...ete-dispensationalism-refining-it-down.10705/
If video is too long:
The main difference is in how they interpret Matt. 24 and Hebrews (and sometimes James).
These are the 2-3 places Calvinists (and Catholics before them) get their doctrine of "Perseverance of the Saints".
Essentially, Dispensationalists see God doling out instructions to 1 of 3 people groups in the Bible: Jew, Gentile, or Church (Jew + Gentile).
They interpret Matt. 24 and Hebrews with more of a literal application to the Jews, and less so to the Church.
By contrast, Calvinists get their "Perseverance" doctrine from these books because they apply everything in the NT to the Church.
We have to remember that John Calvin was Amillennial/Post-millennial in much of his teachings, which is wildly different from Premillennialism, and actually similar to Catholicism.
By the way, Catholics are essentially Covenant Theologians, and most Calvinists will agree that Calvinism is far more compatible with Covenant Theology than Dispen.
MacArthur has a very unorthodox view, I've read he once referred to himself as something like a "Quasi-Dispensationalist" or something of that nature (though I haven't spent time looking into it personally).
I have a friend who attended a high-tech, upper-class IFB church in Newport Beach (not every IFB is the same) who said many of the older members there have a very negative view of MacArthur for trying to go off and do his own thing. Probably the reason why Dr. Ryrie (a Non-KJV "dispy") of the Classical Dispens, stood against MacArthur's doctrines.
MacArthur got famous by making friends with the New Reformers who all hold Calvin and Spurgeon in high regard (who taught things like regeneration prior to faith), while at the same time copping a few Dispensational doctrines and subtly tossing all the old school Dispens under the bus by referring to their position as "whacky, teaching from charts using a stick" (to paraphrase).
If you know the scriptures, you know you can't interpret them from both a Calvinist and a Dispensational point of view.
There are way too many contradictions, another primary one being the Dispen interpretation that the New Covenant will be fully instituted in the Millennial Kingdom, not now.