You are mistaken, I was not taught OSAS as my gospel because I was raised and confirmed a Catholic (at the age of 13). I never even heard the gospel in a Roman Catholic church, just readings from the gospels and sermons about how we should behave. I was "saved" through the ministry of a faithful coworker who patiently and over many weeks answered my questions about scripture that my carnal mind was unable to reconcile to other scripture (the supposed biblical contradictions). He was able to reconcile every one of those verses to the body of scripture. Then one day I ran into a street preacher who shared the gospel with me and prayed with me. Though I prayed, I did not receive the Lord because I still didn't understand the simplicity of the gospel or the significance of Isaiah chapter 53 (though I knew from my childhood and my very first reading of scripture that the passage was about our Lord. At that time I was so young and ignorant of biblical history that I thought the entire bible was written at one time and by the same author. I loved the book of Isaiah and I was always anxious to read more about Jesus. My concept of our guarantee of salvation came from scripture reading and with the confirmation of sound biblical teachers on Christian radio (and they certainly all aren't sound in their doctrine, but the witness in me found agreement with some as He is able to recognize Himself). I read and reread scripture cover to cover for three years and wore out my cheap copy of a king James bible in the process (the pages separated from the binder and the book literally fell apart.) Since then I've read many translations, the New King James being my favorite. After those 3 years of just reading (and seeing Jesus revealed in the old Testament) I came under conviction that I should be attending a fellowship, so my former wife and I started visiting local churches and attending worship services. During that period of time the Lord kept pointing out a small Baptist church just a few blocks from our house, so I decided to attend a service there and we stayed for a number of years. We both were baptized and made our confession before the congregation at that church though we never became members, and eventually moved on to another congregation in South Belmar where there was more room and opportunity for involvement in ministry, which had become our earnest desire.
I didn't stop reading scripture after 3 years but continued with daily reading and focused more on studying individual books (I'd had a dream that my copy of the JPS Tanaach had water poured over it and that the books became separated which I believed came from the Lord, and I ministered to a number of Jews from the Tanaach and their own HafTorah. I even was granted the opportunity to pray with a lovely old Jewish lady, by the name of Dorothy Cohen, who was a resident at the nursing home where my wife was volunteering. She was a concentration camp survivor but held no bitterness toward God and was delighted to hear the Jewish scriptures and have them explained (Jewish tradition in some places in Europe didn't allow women to sit under the teaching of rabbis and what was explained to them only came from their husbands or fathers.)
Sorry to get so far off topic, but I value personal testimony far more than the opinions of students of the scripture. Our understanding of scripture changes over time because the Holy Spirit teaches us it's meaning over time and applies it to our lives. There's only one true interpretation of scripture but diverse applications of it made by the Holy Spirit to our lives. It isn't possible for the Holy Spirit to misuse scripture, but it's His prerogative to apply it to us in any manner that He chooses in order to sanctify us. That's where many people get in trouble. They simply confuse applications to their lives with the original interpretation and why wouldn't someone do that when it's God using His word to convict of sin and convince us of truth. I'll confess that in my study my mind arrived at many Cultic notions that I'd heard from various cults from passages that I didn't yet understand, but God was faithful to show me the error of my carnal thinking and to dismiss such ideas as error.
I trust what He teaches me, it's my own derived conclusions that deserve scrutiny, but I only offer those as opinion or speculation, and only when they remain in agreement with scripture and the doctrine which leads to salvation.