A lot of muslims seem to live under the impression that islam will take over the world. The funny thing about this belief, is that their own prophet Muhammad said the exact opposite. It will shrink. Islam will shrink back and grow weak, just as it was in the beginning.
It is narrated on the authority of Ibn ‘Umar (‘Abdullah b. ‘Umar) that the Messenger of Allah (may peace be upon him) observed: Verily Islam started as something strange and it would again revert (to its old position) of being strange just as it started, and it would recede between the two mosques just as the serpent crawls back into its hole. (Muslim, Book 1, Hadith 271)
In Sharh Saheeh Muslim, Al-Nawawi quoted al-Qadi ‘Iyad as saying concerning the meaning of this hadeeth:
Islam began among a few individuals, then it spread and prevailed, then it will reduce in numbers until there are only a few left, as it was in the beginning.
So, when muslims are going around and telling everyone and his mother that “islam is going to spread and take over the word”. Which one is lying? The muslims, or Muhammad?