I was involved in the Assemblies of God. I also went to one of their Bible Colleges. To this day, I still have good friends in that denomination. For them, it comes down to a choice between the Catholic Church, the really bad PCUSA church, the liberal ELCA church, or the AoG church in town.
My first exposure to the Doctrines of Grace was through the ministry of John Piper in the early 90s (when I was attending the AoG Bible School). Piper's preaching was the means God used for me becoming a Calvinist. Many years later, I met Joel Beeke at the 2007 Bethlehem Conference for Pastors. Beeke was not preaching, but he was in the bookstore. He strongly recommended that I read the Reformed Confessions. I bought the book, the Reformed Confessions Harmonized, and fell in love with the Reformed Confessions of Faith. Also in 2007, I was passing through Minot, ND on a Sunday morning. I stopped and worshipped at an RCUS church there. It was my first time ever worshipping in a Reformed Church. The service was beautiful. I just loved the way they approached worship. And I loved the way they celebrated the Lord's Supper there. Since becoming aware of the Reformed Faith, I have never lived in a town where there is a Reformed Church.