Mormon 9:19; “And if there were miracles wrought then, why has God ceased to be a God of miracles and yet be an unchangeable Being? And behold, I say unto you he changeth not; if so he would cease to be God; and he ceaseth not to be God, and is a God of miracles.”

Ps. 102:26; “They shall perish, but thou shalt endure: yea, all of them shall wax old like a garment; as a vesture shalt thou change them, and they shall be changed:27 But thou art the same, and thy years shall have no end.”

I use the Mormon verse above to witness to the missionaries.  I have them read it aloud and then explain to me how God was once a man.