That "sermon" is ridiculous on its face.
Amen. I’m suspicious of any “sermon” that doesn’t involve exegetical working out of Scripture. As soon as a preacher gets away from that he is bound to tickle ears and spout the ideas of men. I have no doubt the irony of that in this case was lost to both the preacher & the OP.
Ps- I happen to believe that the name of Christ is the only One by which men are saved; I just think that the preacher ought to let God’s message through him do the offending rather than going out of his way to put himself over others and thereby be a stumbling block himself.
