Christ did not challenge us to become theologians. He challenges us to be childlike, not scholarly or legalistic in our approach to God; He gave us the Beatitudes. If you live up to these you will be rewarded in the next life whether you pray in Rome, Salt Lake City, or a tent out by the interstate.
In my life I have witnessed the spirit of the Beatitudes more often from Mormons as I have "Orthodox" Christians.
Yes, and He also gave us a lot more than that.
Battle against idols, false gods, and false beliefs is a major theme running throughout the Bible.
Christ did not challenge us
Us? Do not presume to speak for all. God's challenge to become better-versed in theology has been issued to many throughout the ages.