Mormonism pretty much states you can become a god and get your own planet to rule. Lol on what basis does this even become possible in their mind?
The basis which makes it possible in their mind -
Is actually the same basis which makes salvation possible in your mind.
That basis is called Revealed religion, taken at face value, trusted and not questioned for historical and internal doctrinal consistency as well as consistency in the experience of the audience to which it applies (humanity).
Most Christians trust Saul/Paul as a prophet who speaks for "Jesus Christ"
Most Mormons accept this and also accept that their own prophets speak for "Jesus Christ"
The better question in my mind is why trust the former and not the latter? Is the distrust based on an examination of doctrine and evidence, or simply a bias based on one's own religious experience?
The ideas Mormon doctrines hold about ruling planets and having spirit children wouldn't be strange or foreign to you if you had grown up in say, Utah, and were raised Mormon and attended Mormon church meetings and listened to Mormon "prophets" and went on a Mormon Mission and lusted after a sweet looking little Mormon honey you thought to marry someday.