There is not much of a distinction between these hateful ideologies. Each and every one of them seeks world domination and destruction of civilisation as we know it.
Christianity = Mohammedanism - Muhammad Marxism = Christianity - Christ Western Liberalism = Marxism - Marx
Dravidianism = a partial derivative of all of the above; and I might add a caricature of the above mentioned imperialist ideologies.
Caricature, because while the first three clearly seek to enslave all others in a robotic fellowship of their respective death cults - the dravidian cult inverts that imperialistic desire, i.e. it seeks perpetual servitude and slavery to Christianity, Islam, Marxism and Western liberalism for itself and it's adherents. Dravidianism is indeed really unique in this respect.