There are many people in the Christian community (not mormonism), who view the church as building. The church is not the building it is the Body of Christ. (I realize we may disagree on who Christ is, Judaism or Christianity the church is not a building.)
Iagree with you about where Yahshua would be the most comfortable and that would be on a hillside teaching, however He did attend synagogue every Sabbath as all good Jews did. He was never acused of being a bad Jew. I believe Jesus/Yahsua is the Messiah of Israel. I believe He is the only begotten son of Elohim (God/generic name). I believe He is God and fully God, part of the Trinity.
Deuteronomy 6:4 tell us that Adonai Elohaynu is echad (one)
composite one, not yachid (one) indivisible one. Says it all.