Judaism, Christianity, Islam

[Gamblor]

Why is the Jewish religion considered a world-major religion - one of the big three - so to speak?

With 14 million members and even less observant ones, I don't see how Judaism has any right to classify itself as major, even if it was one of the "originals". Is paganism a "major" religion? Is Greek-god worship a major religion?

Shouldn't Buddhism, Shinto, etc. etc. be considered one of the big three over Judaism?

I don't buy the roots-of-western-religion argument, because Islam is not a Western religion.