Tbf, traditionally, the church wasn't going around doing polls or quizzes about what the congregation believed. For most of history, church services were conducted in Latin to illiterate audiences, while the theological debates they were executing people over were often about highly nuanced and esoteric topics. For the average lay person, it wasn't expected that they understand everything, so long as they were willing to defer to whatever the church told them if they said something wrong. Some would say that this shows the church has always cared more about obedience and authority than teaching about the faith (I'm Some )

That said, "Jesus is God" is like, it's basically right there in the name "Christianity."