Gospel Standards, pg. 15; “JOSEPH SMITH AND MORMONISM. I have met hundreds of men who have said: “If it were not for Joseph Smith I could accept your religion.” Any man who does not believe in Joseph Smith as a prophet of the true and the living God has no right to be in this Church. That revelation to Joseph Smith is the foundation stone. If Joseph Smith did not have that interview with God and Jesus Christ, the whole Mormon fabric is a failure and a fraud. It is not worth anything on earth.” – Heber Grant
Deut. 18:20-22; “But the prophet, which shall presume to speak a word in my name, which I have not commanded him to speak, or that shall speak in the name of other gods, even that prophet shall die. 21And if thou say in thine heart, How shall we know the word which the LORD hath not spoken? 22When a prophet speaketh in the name of the LORD, if the thing follow not, nor come to pass, that is the thing which the LORD hath not spoken, but the prophet hath spoken it presumptuously: thou shalt not be afraid of him.”
Mr. Grant was right. If you accept the Book of Mormon you have to accept Joseph Smith, they go hand in hand. Without Smith Mormonism is nothing.