Why do Muslims want to take over the world?

yes.

this is promise of God in Quran.

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Islam in its orginal sense is full submission to God; the Creator; as the one and only one God with no partner, no companion, no associate, no son, and no equvalence.

Hence it is the God religion since start of universe creation.

Islam per Torah revelation to Moses is called Judaism

Islam per The Bible revelation to Jesus is called Christianity

Islam per Quran revelation to Muhammad is called the very name Islam.

Muslims believe that Jesus will come back from Heavens and will call to Islam (submission to God).