Muslims pray-
LA ILAHA ILLALLAH
Muhammadur Rasulullah

(There no God other than Allah.. That does not mean Allah does not have any other name! It also does not mean that Allah does not have any other form! In fact, the verse emphasizes just that God or Allah is only one. There cannot be two or multiple Gods. It does not put restrictions on any power of God which includes omnipotence.

God being omnipotent can assume any form, can do whatever he wants, can negate what he does not want and can do anything unthinkable. )

This verse further says Mohammad is his only messenger.
(Only messenger of his time. It should not be taken as only messenger of all the time. It this view is adopted then it would mean there cannot be any saint and that there cannot be any possibility that any human being can achieve sainthood. It simply impossible. All the scriptures guide humans towards God. And if no one can achieve God anytime, then all scriptures would be rendered worthless. The one who attains God also acquires all powers of God and automatically carries the message from God to the masses and thus becomes a messenger of God.)

Thus this line does not give any right to Muslims to go on destroying places of worship of other religions and go on killing the persons of other faith!