Maybe it isn't chr*stian. Maybe Fundamentalist Protestantism isn't chr*stian. Maybe that's the wrong word.
Maybe they're "Biblical."
After all, why does any Protestant believe in chr*stianity in the first place? Only because "the bible says so," correct? Isn't J*sus ultimately just another biblical character--the most important one, perhaps, but owing his claims and his authority to nothing other than Biblical assertions?
The "old testament" is a lot longer than the "new." It covers a lot more history. The "new testament" is but a snapshot of the church's birth; the "old" describes the world from the day it was created until the end of the First Exile. Catholics and Orthodox have two thousand years of history to look to for heroes and for systems of how the world should work. Fundamentalist Protestants have the "old testament."
Now . . . just how much critical thought does it take to simply consider the possibility that the "new testament" may not be what it claims to be . . . maybe it doesn't belong, maybe it was added by men? Fundamentalist Protestants have no trouble whatsoever dismissing the Apocrypha or the "book of mormon" . . . isn't it just an application of that same logic to judge the "new testament" by the "old" that preceded it . . . and find it wanting?
Dispensationalist-type Protestants are drawn to the Jews and Judaism by their Biblical sentimentalism. One wonders where the sentiment of supersessionist Protestants (who reject the Hebrew Bible and the two thousand years of liturgical chr*stendom) draws them? They don't seem to have much of anything.
Chr*stianity is not self-evidently true. It is true only if it is authorized by the Biblical G-d. All it would take is a little critical thought, the ability to read the Hebrew Bible without the assumptions imported from the "new testament" (a logical fallacy known as "affirmation of the consequent").
But don't worry. I once had hopes that this would happen, but I have given up. The Dispensationalists, and all the other chr*stian Zionists, have a "new testament" in their bibles and they would no more question it than they would the first eleven chapters of Genesis. They don't know how it got there; they don't care how it got there. All they know is it's there, and that settles it. So unfortunately, my friend, you have absolutely nothing to worry about. Would that it weren't so!