Jesus never told his followers to go out and physically expel people from a land and take it over, and he explicitly rejected an earthly kingdom.
Joseph Smith did believe in territorial domination and his kingdom was very earthly. And it got even more earthly when he had the “revelation” about polygamy.
In any case, I hope you’re not equating your “prophet,” Joseph Smith, with Jesus, the Son of God. Joseph Smith himself did, with his doctrine that he and all of us become gods. Well, actually, not all of us, only the white men. Although I believe that black men now get in on it, after the revelation of the head Mormon some years ago permitting black males to be considered priests.
I suspect you are probably one of the Mormons who is attempting to come back to a good evangelical-style Protestant Christianity, and I think this is a wonderful thing. I wish you all the best, but I think there needs to be some honesty about Mormon beliefs first, and then perhaps Mormons can be reconciled with Christianity.
An excellent book that I read some time ago was Krakauer’s Under the Skies of Heaven, about Mormon fundamentalists.
I have always been interested in this because about 30 years ago, purely by accident, I happened to camp at the place where the Mountain Meadows massacre occurred. I did a lot of reading about it at the time, and unfortunately for the good Mormons, I think this movie is pretty accurate.