I'd like to push back a bit on the notion that the Bible is largely impossible to truly understand and that this is made obvious in the myriad of denominations that exist. In the city where I live, there are three main Baptist conferences: Baptist General Conference, North American Baptist Conference, and the Fellowship Baptist Conference. Aha! See? Even within their own denomination, Baptists can find a consensus of belief! Not so. In fact, the denominations are distinct from each other mainly as a consequence of cultural heritage and geography, not doctrine. I've been in all three types of Baptist churches and hear exactly the same doctrine preached in all of them. The Baptist General Conference of Canada got its start among immigrant Swedish folk; the North American Baptists, in my city anyway, were primarily German immigrants; and the Fellowship Baptists, as far as I understand, have their origins in the States. Over the fifty years I've been a Christian, I've been in Missionary Alliance, Evangelical Free, Mennonite, Nazarene and a multitude of non-denominational churches and hear preaching in all of them almost exactly like the preaching in my own Baptist church. Many of the differences among Protestant churches have to do with peripheral doctrines and political structure, not with radical departures of fundamental doctrinal perspective among them.
And what of the monolithic character of the Roman Catholic Church? So often I hear RC folk deride Protestants for their many denominations but within Roman Catholicism sects abound. The Roman Catholic Church is far from a unified religious monolith, uniform all the way down, free of variation in belief and practice. There are divergences in rites (Latin, Alexandrian, Antiochian, Armenian, etc.), in hierarchical oversight (Independent Catholic churches - Free Catholic Church, Celtic Catholic Church, Polish National Catholic Church, etc.) in monastic orders, and so on. Consider the most recent Pope whose...unusual teachings and decrees have incensed so much of the Roman Catholic laity. And when I talk to individual Roman Catholics, I hear among them a wide spectrum of belief and practice that quite surprises me sometimes. It is something of an illusion, then, that the RC church promotes that all within its borders of religious authority are perfectly homogeneous in practice and belief.
Is God's Truth ultimately unknowable? Not at all. But it certainly may seem so to people who have been subtly but profoundly dumbed-down, as is largely the case in western nations, unmoored from a thorough understanding of reason and logic, accustomed to sound-byte thinking rather than quiet, careful, complex argumentation, and tremendously juvenile in their understanding of their own faith. The truth is that most - not all - of the Bible is remarkably straightforward, its meaning readily extracted, especially under the constraints and guidelines of Reason and sound principles of interpretation (hermeneutics), as well as within a real and deep walk with God.
Modern, western Christians have fallen prey to deferring to the expert, as though deep fellowship with God is the domain of only a select few who've earned a degree (preferably a Phd.) at a seminary or, at least, written a book about Christian living (and maybe have a YouTube channel, too). Such deference usually occurs, though, in tandem with an unwillingness to do the necessary work to be a well-studied believer in one's own right, and daily experiencing God in a joyful, life-transforming way. And so, as the modern, western Christian Teaching Industry and the internet proliferate the voices of spiritual "experts" declaring to believers (who are mostly, concerning their faith, the proverbial puddle that is a mile-wide but an inch deep) all sorts of contradictory things, their inability to make sound, critical assessments of these "experts" leaves them thinking that God's truth is utterly obscure.
Often, too, modern believers simply don't want to accept what the Bible teaches. They want to pick and choose, as they commonly do in the consumerist, post-modern West. God restrains too much in His word, and with point-blank unequivocality. He doesn't budge in what He says and this makes modern Christians steeped in the relativistic thinking of western societies squirm and look for a way to blunt or deny God's truth. Thinking that what God really means in His word is ultimately impossible to get at is one way some believer's give themselves all the "wiggle room" they want in shaping their faith to their own personal preferences (I'm not saying this is necessarily true of contributors to this thread).
Anyway, I could ramble on, but suffice it to say that God's word is not an inscrutable collection of unfathomable mysteries. If we want to know His truth, He'll show it to us. But we'll have to work at carefully studying His word, persistently and consistently, and stretch our Netflix-paralyzed brains uncomfortably, and submit ourselves constantly to the Spirit's illuminating control.
Psalms 119:105, 130
2 Timothy 3:16-17