Rhetorical: "…can ye withstand these sayings…" Alma is asking his audience of they can hear these words and not be effected by them. Can they hear these things and [still] "trample the Holy One under your feet…"
Note the very specific evidence that he gives of those who are currently "trampling" the Holy One - those who wear costly apparel and set their hearts upon the riches of the world. As we have seen, these are the specific traits of the competing religious idea that have been plaguing Nephite society from at least the days of King Benjamin, and were probably at the heart of the reason Mosiah I fled the city of Nephi.