There has been a divide among different evangelical groups regarding the RCC for some time. When I was going through my "... is, is, is the RCC Mystery, Babylon the Great?" phase, I came across a book in
1995 which gave me pause to reconsider. I bought that book, of course. (And I've listed it below).
From that time on in the mid-1990s, I had something to reflect upon by which to break the spell I was under while doing my initial research of Church History. And since then, I've become aware of other evangelicals who are more or less open to fellowshipping with those in the RCC as well.
As it turns out, it's usually the more conservative Calvinistic evangelicals who are antagonistic toward the RCC. Other sorts of evangelicals are less so, or sometimes not at all. I'd have to look up more info, but I'm guessing that even before 1995, there have been a number of evangelicals who have always been open to fellowshipping with the RCC (or with the Orthodox).
Geisler, Norman L., and Ralph E. MacKenzie. "Roman Catholics and Evangelicals." Agreements and Differences. Grand Rapids: Baker Academic (1995).