Lunz, are you suggesting that ALL Christians are satanists?
Within the one Christian faith, there are many different groups, called 'denominations'. Although they share the same basic beliefs, or creed, the way they do things can be very different.
Anglican, Baptist, Catholic (Roman Catholic), Independent Evangelical, Methodist, Orthodox, Quaker etc
The Bible shares that there is only one way that each of us can become a Child of God, or what most commonly is called a Christian. Ephesians 2:8-10 is one set of verses that clearly show that it is by faith we accept Christ and not by any one’s works. Those who have accepted Christ, and Christ alone, are adopted into His family.
A Christian should know his doctrine well enough to be able to recognize not only what is true, but also what is false in a religious system (1 Pet. 3:15; 2 Tim. 2:15).
There are many different types of people or groups that claim to be Christians.
Mormons, Jehovah's Witnesses, Christian Science, Unity, The Way International, Church of Scientology.
Nevertheless, what makes something non-Christian is when it denies the essential doctrines of the Bible.
Jesus warned us that in the last days false Christs and false prophets would arise and deceive many (Matt. 24:24). The Lord knew that there would be a rise of the spirit of Antichrist (1 John 4:1-3) in the last days. Its manifestation is here in the forms of Mormonism, Jehovah's Witnesses, and the New Age Movement, among others.
I would appreciate it if you didn't lump all Christians in one pile.
Before you start calling us devil worshippers take a good long look at your "religion."