The original intent was changed in the 1st Century when all world religions converged on Jerusalem to consolidate beliefs. They all left in disagreement.

Then Christians split between The Virgin Mary (Catholic) and Christians (belief in Jesus blood). And Islam and others went on with their belief systems all living under Roman LAW for a few years.

So yes, at some point Islam became 2 billion in population with territory larger than Russia and according to dar ul Islam must attempt Global Domination to make the whole world Islamic.