It is obvious to me that some Christians enjoy bragging that they have "spiritual discernment" to properly understand the Bible, whereas non-Christians do not. However, what these Christians seem to forget or ignore is the fact that we (and many other non-Christians) were once devout Christians and are well-versed in the Bible. These non-Christians read it, studied it, and prayed for spiritual guidance when they were Christians, just as I did. We didn't forget what we had learned when we renounced our Christian faith. We maintained this knowledge and are now able to use it to challenge the credibility of the Bible.
I'm not an atheist, but as a former Christian, I refer to what you are saying as "removing the rose-colored glasses." I believe this is what helped me better understand the Bible while I was deconverting from Christianity. It was a genuine reexamination of my beliefs, which eventually led me to renounce my belief and faith in God and abandon my Christian faith. My deconversion gradually began as I was training to be an evangelism team leader and a street preacher. However, my questions and doubts about God, Jesus, and the Bible became more substantial while I was assisting my nephew in obtaining his Master of Theological Studies (MTS) degree in order to become an ordained minister. In fact, our extensive reading and study of the Bible and Christian theology led us both to deconvert from Christianity. During the thirty years I was a devout Christian, I thought that reading and studying the Bible on a daily basis would deepen my Christian faith, but all I did was eventually study my way out of believing in God, Jesus, and the Bible. I genuinely believe that I'm far better off in my life without what I consider to be the entrapment of Christianity. I also believe that it was one of the best decisions I've ever made.