Every Muslim is a Christian heretic--technically, Pelagians, since they don't accept Christ as theotatos somatikos, God in the flesh, but only as a prophet, and moreover a prophet who didn't get the job done--and the bigger the Muslim, the bigger the heretic.
Every Hindu is a Christian heretic, since they believe Christ to be just one of an infinite number of avatars of the Brahman, which is the universe, not the God who created and sustains the universe.
That's just two, but together the two heresies comprise two billion people on their way to eternal damnation. Victoria Osteen, at worst, is misleading Christians into acting and thinking in ways that will make it more difficult for them to walk in God's will--and at best, she is leading many people to Christ, who would otherwise be also on their way to eternal damnation.
And without strong Christian teaching people will fall for other heresy.
You know her hubby denied the exclusivity of Jesus, don’t you? Opens the door for people to wander off into Mormonism, Hinduism, Islam, etc.
Besides, Scripture warns us to be on guard about heretics who call themselves Christian, not those outside the church.
I wonder if you didn’t mean to refer to Muslims as Arians. Arianism denied the divinity of Christ and insisted he was part of the created order. Pelagianism, semipelagianism, and Jansenism were all heresies concerning the interaction of grace and free will.