I guess this is why the Nicene Creed says that Jesus "was begotten not made."  If Jesus was made, then there is the possibility that God could make other sons.  

As it is, to hold that Jesus was made in the same sense that Lucifer was made can thus be safely at least declared "non-orthodox" and out of keeping with orthodox Christianity, at least as it has been defined since 325 AD.

A Mormon, of course, will object that the Nicene Creed wasn't given by revelation.  That may be true, but it still puts them at odds with 1700 years of Christian scholarship, and so in my mind, at least raises the bar / puts the ball in their court to prove otherwise.