He had made no provision for the perpetuation of his own dominion, and hence it was not without a struggle that a successor was appointed.

At length Abubeker, the father of Ayesha, was selected.

He was proclaimed the first khalif, or successor of the Prophet.
There is a very important difference between the spread of Mohammedanism and the spread of Christianity.

The latter was never sufficiently strong to over throw and extirpate idolatry in the Roman Empire.

As it advanced, there was an amalgamation, a union.