Bingo.
As satan is a counterfeiter and author of lies it makes sense he would have his own religion
Satan owns every religion but one. Think about it logically. Either one religion is true or all of them are false. They can't all be true. Two contradictory truths cannot logically exist. For practical reasons in the temporal world, religious tolerance is a necessity.
Adventists believe that the Pope is the Antichrist. Catholics (until Vatican II) required that Protestants who converted be rebaptized, because they didn't recognize those churches as legitimate. Evangelical Christians bash Mormons and Jehovah's Witnesses who likewise profess Christ as their savior. The Russian Orthodox Church seeks to limit proselyting by non-Russian Christian religions, like Pentacostals and Baptists. Muslims consider Jews and Christians to be prophet-killers and polytheists. Hindus feel threatened by Christian proselyting.
I would hope that every person fervently believes his own church is the true religion and affords everyone else the right to have the same belief. In the end, I think we'll be surprised who is in Heaven and who is not.