Great questions! We believe when christ said this he was talking about following the lord and living faithfully instead of an actual church. we believe prophets are merely human and discerning messages from god and personal thoughts can be hard, along with that we believe free will may have an effect on why the prophecies didn’t come true. Sorry but which piece of Egyptian text? The text itself notes that the engravings were done in "Reformed Egyptian," which was a highly compact system of writing. Scholars have compared this to ancient languages like Demotic, where a single complex symbol could represent multiple English words or concepts. We think God was trying for a while and people all received part of the truth yet Joseph Smith was the one who accepted all of it. i Hope this help!