They believe in the father of Abraham.
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I suppose they do believe in Terah, but I was never taught that they thought he was God.
Although, Brigham Young DID teach that ADAM was God, and he was speaking as a prophet at the time.
BTW, I used to be LDS, I know exactly who their God is and it is in no way the God Christians, or Jews, worship.
I used to be LDS as well - so I know as you.
Don’t put down good people trying their best. It is unbecoming.
If you had all the answers you’d be God - don’t elevate yourself to that level.