I think friendly discussion..not debate and I think they would say they only “worship” the god of this planet... that they believe makes them monotheists ???
If I’m not mistaken,
part of the creed is that God (capital G) was once like us humans,
and we are destined to be like He is.
The only incorrect way for the Mormons to handle this issue is to lie about it...
If that’s what you believe, state it and defend it.