We have core doctrines that we must all adhere to. Other teachings are often left for personal consideration. For baptism, you would be asked if you believe in God the Father, Jesus Christ and in the Holy Ghost. There is no other requirement for us as LDS but to worship the Godhead.
The key to all of it goes to this: was Joseph Smith a true prophet of God? If he was, then we would at least keep an open mind on things he taught that may or may not be doctrinal to us now.
If Joseph was God's prophet, then worrying about small issues like that is immaterial. If there are other gods, then our disbelieving it doesn't help. If there aren't, then it doesn't matter what we believe. But it does matter whether we should follow living prophets' counsel and direction, if they are indeed prophets of God.
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