R&I ~ Løki
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The idea that there are only two religions, comes from the story of Cain and Abel.

Both men were instructed by God to bring an animal sacrifice to atone for their sins.
(A precursor to what Jesus Christ would do on the cross thousands of years later.)

Thus making Biblical Christianity, not only the oldest religion in the world, but the only one that is acceptable by God.

Able believed God's instructions, and his sins were atoned for.
Cain on the other hand, did not believe God and proceeded to try to bring about his salvation by the works of his hands. i.e. Good Deeds outweigh Bad Deeds, “I’m a good person” "My Own God" etc—

Every religion, except biblical Christianity, has this false doctrine as their core belief.

They may look a little different,
some of their rituals not quite the same,
and sometimes, even call themselves “Christian”.

But they are nothing more than an amalgamation of the false religion began by Cain.
So ultimately, even though there seems to be many religions, there are only two.

And also, even if you claim to have NO religion, no matter how much you insist,
you still fall under Cain's religion.

Choose wisely.

So as the title suggests. Are there actually only Two Religions?

The Bible says yes. What say you?