Most Christians see the Mormons and JWs as cults because they accept things that are not possible according to scripture, most Christians accept that the Bible (word of God) is the only prescribed doctrine. Many denominations and Christians alike interpret scriptures differently, why, you need to ask them. None of us are totally right and God knew this would happen, so this is my belief, those who seek God's will should listen to His desire of which church they should join, even if they do not believe all that particular denomination believes. If one desires to work for God as God desires and to strengthen the Kingdom, one should be able to set aside these differences for the purpose of doing God's will. God knows I have some differences with the beliefs of the Southern Baptist Church and I can accept that, because who other than God can say I'm right or wrong.
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God loves those who believe and those who do not and the same goes for me, you have no choice in this matter. That puts the matter of total free will to rest.