Occult is primarily an adjective, not a noun, so your sentence would then make more sense if you said "the occult" as it is a generic label.

It's also worth noting there are plenty of Christian Occultists. Many would argue (usually the wisest) that the Bible is a preeminently Occult book. Confirmation of this can be found in all over the scriptures, a prominent example of which would be Matthew 7. Truth is never plainly understood, though it is always hidden in plain sight.

"Occult" has become a generic catch-all used by the Christian Church to mean heretical, and has devolved to the point today to mean "devil worship" by the ignorant, though the term itself bears no relation. Kind of like how "conservative" is used by the Left to refer to the mythological 'bible-thumping, people-hating, bigoted Republican' rather than one who believes in conserving liberty.

Occult simply means hidden, as in the hidden or subtle laws of Nature. Words matter, and being aware of their political degradation is also important.

There are those that use the "occult arts" for evil (i.e., selfish ends), but how is that any different than those that use the sayings of Jesus from scripture to achieve the same? Unfortunately this will likely fall on deaf ears, but perhaps someone else may learn something in the comments about what the Occult really is, and what it isn't.

Thus i specifically mean that any religion or denomination that don't hold Jesus as the deity believe in supernatural or supernormal powers which a man has some secret knowledge.

According to your biases, "cult" would still be a more appropriate term.