That's the point, I was taught to believe in the Christian god (without question) long before I ever read the Bible...and the Bible spoke of a very different being. Anyone comparing my belief to the Bible would rightly come to the conclusion I hadn't read my Bible...at least not all of it.
For me, I was in a place of desperation when I turned to the Bible, and I read it the first time as though God were speaking to me.
What possessed you to pick up a Bible and not a Quran? Clearly, you were being influenced by culture, authority figures, etc., to believe the answers were in that particular holy book rather than another. You had beliefs about the Christian god before you had read the Bible. Our stories are not that dissimilar.
It was because even though my parents were not overly religious, even lived like atheists by their lifestyle to some degree, they did not discourage my faith. One of my fondest memories from my youth was of my mother and me kneeling by my bed and saying a simple prayer, "Gentile Jesus, meek and mild, look upon this little child. Pity my simplicity and suffer me to come to Thee. Bless Mommy and Daddy, cousins and friends, and make me a good boy, Amen."
Another is a Bible which I still have which was given to me by my grandmother with her written inscription quoting Jesus, "Suffer little children to come unto me." So, even though I did not know my grandmother well (I only met her a couple of times) I had an ally praying for my salvation. I also had other allies praying for my salvation later in life when I had a car accident in South Africa in 1979 because my roommate in the game reserve I worked on was a "born again Christian," so was another staff member. Four members in the car suffered life-endangering injuries, including me.
Other fond memories from earlier life were of a Christian family who befriended me and took me to a Presbyterian church on Sunday during my early teens.
So, when I ran into difficulty in my mid-twenties I had a foundation to turn back to and sought after God. When my father died in 1979, I went back to South Africa. His death triggered my quest for meaning in life. The events that happened after that orchestrated my coming to faith, as I look back on them; as I said the car accident being one of those incidents, but there were many other "coincidences" that drew me to God. My uncle who lived in a suburb of Cape Town would take me up the mountains to cut down a tree that was choking out the indigenous vegetation. As we climbed he would quote Scripture to me, "As you sow, so shall you reap..." I kept running into Christians during that period in my life who left an impression upon me. I kept having things happen that while uncomfortable lead me to seek meaning.
Although I accepted the teachings of Christianity in the early 1980s, I only started investigating the biblical faith when I started attending church, evangelizing, and meeting secular and other religious faiths roadblocks and contrary teachings to the Christian faith. I have spent extensive periods of my life investigating opposing beliefs and finding out what makes them tick. I have read extensively great Christian thinkers in trying to respond to unbelievers' objections. I have tackled a number of religious faiths in getting to their core beliefs. God has continually confirmed His Word during this time as being able to make sense of life's ultimate questions like no other religious view I have examined can, including atheism and agnosticism, especially atheism and agnosticism.
Where our "stories" depart is that during difficulties and times of testing I did not turn away from the faith and was rewarded for my perseverance. You turned away too soon. Through God's grace I pray that in His mercy He will lead you back from your apostasy to trusting Him, nevertheless His sovereign will determine what happens. So, go your own way, and may God be merciful to you and your family that you may find hope and life in abundance. Time will tell.