What motivated me to write the OP is the generally decrepit state of knowledge of basic theology in our churches.
Agree 100% that Christians need to be more theologically aware, especially when it comes to the Person, life and death of Jesus Christ.
When I came to Christ, I ended up in the eastern "orthodox" church. Within a year, however, I came to realize how that "church" rejects Penal Substitutionary Atonement, dismissing it as "a western HERESY invented by Anselm." In their view, Christ overcame death on the Cross by perfectly loving all those who were beating and mocking Him, and now,
we can do it too! Just imitate Christ's perfect love (by reading fantastic, usually grossly embellished if not made-up tales in various Synaxaria of the lives of the saints) and, maybe, just maybe, if you try hard enough, you can make it to heaven too!
That's the eastern "church's" understanding of the Cross right there...and it's completely wrong, and if you get Christ's life and death wrong, and you will get the Gospel wrong. Which is precisely what has happened in the eastern church, and which explains why Christ is never the focus over there, but instead they focus on Mary, icons, dead body parts, 777 saints-du-jour, and volumes and volumes of fantastic tales from their lives that read like something that is a mixture of J.K. Rowling and Stephen King.
TL;DR: my own theological awareness, specifically about what Christ did for us on the Cross, allowed me to come to the realization that the "church" I joined rejected the Gospel, and I acted accordingly by leaving eastern "orthodoxy" and becoming Reformed.
And, one last thing: when I would bring all this up, the response from the priests and my fellow laity was: "all the theology you ever need is in the liturgy!" Don't be bothering with anything else if you want to know our church's "theology." It was apparent that they DESIRED people to be theologically ignorant, which makes total sense in hindsight.