Considering that Jesus said he was founding a Church, which would never teach error, and which would exist until the end of the world, it seems highly probable that somewhere in the world right now there is the Church Jesus founded. Since that Church would enjoy the infallibility Jesus promised, it follows that no church that does not claim that infallibility could be the one Jesus founded.
The classic evangelical answer is that it is the collective body of all believers. This cuts across all denominations (well, it would skip those without believers).
I don’t know about an infallibility claim — the historical church has made a lot of mistakes — but a promise that the gates of hades won’t prevail against it is realistic because it is rooted in permanent salvations. Evangelicals do assert that the closer to the Holy Spirit you get, the more reliable your doctrine will be. If you fail to avail yourself of that and thereby sin, it isn’t God’s fault but yours.
Namely — I think that being folded into the starting assumptions is that we have to have some denomination that is the Utterly Correct Church.
But if we dismiss that assumption, we still do not come up with illogic. We have a church that frequently stumbles but never completely falls, and which still has a positive promise to look to, that of the fruits of the degree of individual dedication to the Lord it shows.
Anyhow, I believe by virtue of the Lord I have met and who sticks along with me no matter how bad I muff it. This is something that goes to a mystic, supernatural level and it is tangible every day. The church is part of His promise and I am part of it by virtue of the salvation He has bestowed. How well I live as a Christian depends on what I do with Jesus in my life. How well the worship organizations I worship with do managing as churches, depends on what they do with Jesus in their lives. The more faithful to the Lord, the better the results.
Though you may not (yet) agree, I think you can probably see why evangelicals view the concept of a One Correct Roman Catholic Church as a phenomenon of religion among men.
That's it eh??? Your religion claims it is infallible so, it is infallible...I guess if you are a four year old, that could make some sense...