The scholars have listed many reasons for the weakness of the Muslim
Ummah. They are all aware however, or at least some of them are aware,
that the Prophet ( sallallaahu 'alayhi wa sallam) compiled these
reasons in one sentence, in an authentic hadeeth when he ( sallallaahu
'alayhi wa sallam) said:
"The nations will soon gather up and call upon each other to gather up
against you just as the diners call upon each other to the dining
plate."
Someone asked: 'Is it because of our little numbers at that time?'
The Messenger of Allaah (sallallaahu 'alayhi wa sallam) said:
"Certainly not, in fact, you would be numerous, but you would be like
the foam of the ocean. And certainly Allaah would remove the fear of
you from the hearts of your enemies, and He would certainly cast
weakness (wa hn) into your hearts."
Someone asked: 'What is this weakness (wa hn)?'
He (sallallaahu 'alayhi wa sallam) replied:
"Love for the worldly life and hatred for death."
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http://www.islamscience.com/worship/weaknessUmmah.html