Due to the departure from Scripture on so many areas Roman Catholicism is not Nee Testament Christianity. The Immaculate Conception is but one proof of that departure.
And yet Protestants threw out seven entire books of Scripture.
I have no idea what "Nee Testament Christianity" is, but it is certainly closer to NEW Testament Christianity than the 30,000 various protestant sects that didn't exist before the 1600's, and now lecture everyone else on the "correct" way to be a Christian.
We got it all wrong for 3/4ths of Christianity's existence, apparently.