I also changed my mind on a number of things, after being saved.
I started out in charismatic/dispensational churches. I gradually came to believe that most of what I was hearing in churches was just emotionalism and trying to keep up with the "experiences" of others. God told me to depend on the Bible, not false prophets or hysteria. I quietly left the church, and went to more balanced churches. As in, eternal security and Reformed theology. And I am not sure that the speaking in tongues was "of the devil." What I saw and what I participated in, was more of the flesh. But then, who knows? The churches I was in were not over the top, so that was my impression, knowing the people.
I had several people trying to convince me of the truth of Word Faith. I wasn't feeling it, but there seemed to be some Bible verses supporting it, especially when I was healthy! But when I got sick, God showed me all the verses refuting this heinous heresy. And of course, when my friend, the Kenneth Copeland ordained pastor died of breast cancer, because she "claimed" heaing instead of getting free medical Canadian health care treatment. God led me to read a pamphlet, when another friend got trapped in this nonsense. I told her we were going to do a Bible study on it, but once she read it, she was convinced. Well, until recently. She got delivered of "depression" and "oppression" only to have to spend weeks away from people, and reading her Bible with their "deliverance guidance" books. Gordan Fee is one of the top Greek scholars in the world, and a Pentecostal, and his analysis of Word Faith completely debunked it, without imposing his person views. The Word of God always leads us to the truth!
I will honestly say, although the pre-mill, pre-trib rapture stuff was preached at me, and every person I know was constantly predicting Jesus immediate return, because sign "X" or "Y" had been fulfilled, it always rang false to me. It was such a relief to get away from churches that said you weren't saved if you didn't believe in their brand of eschatology. Seminary was good, as we were allowed to study all the different viewpoints the supporting scripture and make up our minds about which was right. That was really being set free, for me!
Last year, after 35 years, I was reading Daniel and Revelation at the same time. (I always am reading through both Testaments). It was pretty incredible to be in the verses which related to each other about this topic. I felt God give me a real release to start studying eschatology. Several people here recommended books, as well as other books I had since seminary. I did read again, about every eschatological position. But it became very obvious that partial preterite was what I believed and what God had been showing me. I even read a lot of things to my husband as we were traveling along the road on vacation. He is now moving over to a more sensible eschatology!
Finally, most of the charismatic denominations I attended were Arminian. (Except for one group of "heretics" who were Reformed! LOL) It was a terrible feeling, to think that anything I did might result in me losing my salvation. I was defeated before I did anything. God began showing me Scriptures on how HE saved me, not of my own works. The next step, was that although I didn't know about anyone else, I knew God had me in the palm of his hand, and would never leave or forsake me. Then I began to understand that anyone who was truly saved, was also saved eternally.
It was only in the last few months, through the ministry of various people here, that I got back a sense of the righteousness and the justice of God. In other words, that simply paying lip service to God, and then never confessing your sins or repenting, is antinominanism. So I absolutely agree that God saves us, but that works do follow! (Not to stay saved, but because that is what God expects from us, when he saves us!)
I hope I will always been open to correction in my beliefs as the Holy Spirit leads through the Word of God. But at my age, maybe getting a bit set in my ways? Considering how much I have really changed what I believed, when I got away from bad theology, and dug deeper into the Word of God.