Evangelicalism is not in itself a "confession". It is more of a general grouping of similar confessions. As such, it is a bit hard to pin down on a specific point of doctrine like your question calls for.
That being said, we could paint with a broad brush and describe some of general leanings. Every one of these will be wrong for at least some Evangelicals.
There are some evangelical groups that consider some other evangelical groups to be apostate* (not true churches). However, these tend to be exceptions rather than the norm.
Most evangelicals tend to hedge salvation more on the basis of belief rather than church membership. In other words, even if they believe the Roman Catholic church to be a bogus organization and many of its doctrines to be false, they will acknowledge that some of its members are legitimately Christian.†
Most evangelicals specifically reject many of the doctrines, most of the structure and all of the authority of the Roman Catholic church. Those that do accept any of the above do not recognize it in full, but only in the parts that are in agreement. They would reject almost everything to do with Mary, but might agree one some points about Christ. They will reject the notion that any Pope could ever speak infallibly while agreeing that Scripture invokes a system of appointed leaders over churches.
Most evangelicals believe that due to the dangers of the false doctrines woven in among some true ones, it would be a bad idea to place ones self under the sole direction of the Roman Catholic church. As such, people who do are often regarded with much skepticism as the creed they have hence subscribed to is dubiously compatible in any way with their own.
The issue of where to draw a line between a "false God" and "the right God not properly understood" is a tricky one to draw. Most evangelical circles would use some of the more basic and early creeds (such as the Apostles & Nicene Creeds) as a measuring stick for whether the right God was being worshiped. A non-triune God or a religion that doesn't recognize Jesus as God's only son for example would be considered to be worshiping a false God, while if those and some other elements were in place but his works and words were badly misinterpreted it may be just a matter of mistaken doctrine without actually being a "false God".
For an overview of the issues involved here, I highly recommend carefully reading a blog post from my friend Kevin Bywater entitiled Do Muslims, Mormons, and Christians Worship the Same God? in which he works to articulate the core theological problem involved no matter whether the right answer is yes or no. As one of the basic points, he notes that "Worshiping God wrongly is tantamount to worshiping the wrong god(s)."
In light of the previous point, Catholisism started out with some of these same creeds and many participants still hold to them. However evangelicallism would, in general, say that it has wandered very far from them with all the things it has added. In doing so, the waters are so muddy that's its hard to get a pure drink of living water there.
Most Evangelicals also recognize that there are Catholics and there are Catholics. Some in the US might be viewed as partners and there are even major ecumenical talks always going on somewhere or another. On the other hand much of Latin America and Europe are so far gone from even Catholic teaching that it would be impossible for most evangelicals to recognize them as Christian.
One notable reference on this would be the Westminster Confession. While only some subsets of evangelicalism would fully hold to this confession, it is indicative of their varying positions that in it's original format, Chapter XXV Article VI identifies the Pope as the antichrist himself:
There is no other head of the Church but the Lord Jesus Christ: nor can the Pope of Rome in any sense be head thereof; but is that Antichrist, that man of sin and son of perdition, that exalteth himself in the Church against Christ, and all that is called God.
More importantly, it is to be noted that this statement has been removed from the revised version most commonly used in the US and much of the rest of the world in modern Reformed churches. The statement now accepted by most people holding to this particular confession reads simply:
There is no other head of the Church but the Lord Jesus Christ. Nor can the Pope of Rome, in any sense, be head thereof.
* I have avoided using the term "pagan" because the context of your question indicates we probably don't have a common understanding of what it means.
† My personal stance on this issue is that salvation is a gift from God. Correct belief isn't what saves us. Therefore it is possible for some who believe straight up wrong things about salvation to be saved. However this is no excuse to not seek to learn which doctrines are true, and God uses his word properly preached as an instrument in effecting salvation so we should put high priority on true teaching even though we know it isn't necessarily a matter of salvation whether people believe exactly the right doctrine.
