"It Seemed Obvious That Satan Would Build a Large Organization That Would Lead So Many Just Short of Heaven."

Anthony Baratta's swim across the Tiber began at a Southern Baptist Theological Seminary:

I grew up in an evangelical Protestant home. My father was a worship and preaching pastor from when I was in fourth grade onwards. Midway through college, I really fell in love with Jesus Christ and His precious Gospel and decided to become a pastor.
It was during that time that I was hardened in my assumption that the Roman Catholic Church didn’t adhere to the Bible. When I asked one pastor friend of mine during my junior year why Catholics thought Mary remained a virgin after Jesus’ birth when the Bible clearly said Jesus had “brothers,” he simply grimaced: “They don’t read the Bible.”
Though I had been in talks with Seattle’s Mars Hill Church about doing an internship with them, John Piper’s book Don’t Waste Your Life clarified my call to missionary work specifically, and I spent the next summer evangelizing Catholics in Poland.
So I was surprised when I visited my parents and found a silly looking book titled Born Fundamentalist, Born Again Catholic on my father’s desk. What was my dad doing reading something like this? I was curious and hadn’t brought anything home to read, so I gave it a look.
David Currie’s memoir of leaving behind his evangelical education and ministries was bothersome. His unapologetic defense of controversial doctrines regarding Mary and the papacy were most shocking, as I had never seriously considered that Catholics would have sensible, scriptural defenses to these beliefs. 
The book’s presence on my father’s desk was explained more fully a few months later when he called me and said he was returning to the Catholicism of his youth. My response? “But, can’t you just be Lutheran or something?” I felt angry, betrayed, and indignant. For the next four months I served as a youth pastor at my local church and, in my free time, read up on why Catholicism was wrong. 
During that time, I stumbled across a Christianity Today article that depicted an “evangelical identity crisis.” The author painted a picture of young evangelicals, growing up in a post-modern world, yearning to be firmly rooted in history and encouraged that others had stood strong for Christ in changing and troubled times. Yet, in my experience, most evangelical churches did not observe the liturgical calendar, the Apostles’ Creed was never mentioned, many of the songs were written after 1997, and if any anecdotal story was told about a hero from church history, it was certainly from after the Reformation. Most of Christian history was nowhere to be found.
For the first time, I panicked. I found a copy of the Catechism and started leafing through it, finding the most controversial doctrines and laughing at the silliness of the Catholic Church. Indulgences? Papal infallibility? These things, so obviously wrong, reassured me in my Protestantism. The Mass sounded beautiful and the idea of a visible, unified Church was appealing - but at the expense of the Gospel? It seemed obvious that Satan would build a large organization that would lead so many just short of heaven.

I urge you to read the whole thing.

Enlightening.

Here... one more quick excerpt, this just before making his final decision:

I went to the seminary library and checked out books I had previously forbidden myself to look at too closely, like the Catechism and Pope Benedict’s latest. I felt like I was checking out porn. Later, I drove to a 5pm Saturday Mass. The gorgeous crucifix at the front of the church reminded me of when I had mused that crucifixes demonstrated that Catholics didn’t really understand the resurrection.
But I saw the crucifix differently this time and began crying. “Jesus, my suffering savior, you’re here.”

Outstanding description summing up the faith.  Jesus, my suffering savior, you're here.

He is.

Carry on.