Christianity is false for many reasons, but I'll give you one that cannot be argued against. Evolution being undisputably true debunks Christianity, as for Christianity to be true, it requires evolution to be false, as evolution being true means no Adam and Eve, meaning no original sin, meaning no need for Jesus to die to rectify this, as taught by all early and major Christian traditions. The whole narrative falls apart since the foundation is 100% false.
Satanism/Zevism is true because when you study all religions, whether it's from the East or the West, North or South, you'll notice a similar trend of original Pagan religions where the Gods were worshipped along with a Head God, themes of immortality and myths that hint at the alchemy of the soul behind elaborate allegories.
There is a common thread of religious consistency between the ancient Pagan world before corruptions of the original Pagan Religion arose, such as the Abrahamic religions, Buddhism, Taoism, Hinduism in its modern version and so on. We now even have offshoots of the corruptions themselves, such as Sikhism or Mormonism.
You can and should also confirm Satanism/Zevism as being true through the meditation practices as outlined in the Temple of Zeus. Connecting with the Gods is also important, you will feel their benevolent energies.
Once you study the various religions long enough, you'll notice there is a common pattern, and it all ultimately goes back to the ancient mystery religions from Egypt, Sumeria and India, carried on through Neo-Platonism. There is this constant theme of mastering the material world/transcending it as well as achieving immortality which was corrupted with nonsensical corruptions of "heaven" or "nirvana" by later "religions".
Zevism is the revival of the mystery Pagan religions of empowerment, free of jewish and Abrahamic corruption as well as other nonsense developed by neo-pagans, new agers and so on. It's not just a religion, it's the proper method to develop your soul through observable means for yourself and connect with your Creators, The Gods, which awaken parts of you that were long dormant and suppressed by those who fear humanity's potential.
Zevism is consistent with the reality around us and can be confirmed empirically as such through personal experience. Christianity is evidently not consistent with reality, as I demonstrated, and it demands that you believe it blindly through the authority of religious texts and human religious authorities such as the church and its traditions, with no room for questioning.