Cults that propose to be Christian diminish or alter the identity of Christ in some way. J.W.’s and SDA’s teach that Jesus and the Archangel Michael are the same being.
Mormons teach much the same even claiming that Lucifer was Jesus’ brother.
Cults preach “another Jesus”. Paul warned us of this saying, “If I, or an angel from heaven come to you preaching another Jesus other than the One I have preached, let him be accursed.”
IOW, any denomination that you deem insufficiently orthodox. Got it.
That isn’t how a cult is defined.