Cause for calamities to strike the Ummah
Understand that judging by what Allaah revealed in His Book is incumbent upon us, and not doing so results in many calamities befalling the Ummah.
Allaah, the Most High, Says:
Say: "Allaah hath power to send calamities on you, from above and below, or to cover you with confusion in party strife, giving you a taste of mutual vengeance - each from the other." [Al-'Anām 65]
Thawbaan (radiyallaahu ’anhu) narrated that the Holy Prophet (sallallaahu ’alayhi wa sallam) said:
"And indeed I asked my Lord for my Ummah that it should not be totally destroyed by a prevailing famine, nor to allow an enemy to totally conquer it, except from amongst themselves. So my Lord said:
'O Muhammad! When I decree a matter, then it is not reversed. I grant to you for your Ummah that it would not be totally destroyed by a prevailing famine, nor will it be totally conquered by an external enemy, even if all the nations were to rally against it.'" [Muslim 2889]
Sa’d Ibn Abee Waqqaas (radiyallaahu ’anhu) narrated that the Holy Prophet (sallallaahu ’alayhi wa sallam) also said:
“I asked my Lord for three things, I was granted two; but prevented from one: I asked my Lord that He should not destroy my Ummah with drought and famine, so He granted it to me. I asked my Lord that He should not destroy my Ummah with drowning, so He granted it to me. And I asked Him not to cause my Ummah to fight amongst themselves, but He refused that.” [Muslim 2216]
Ibn ’Umar (radiyallaahu ’anhu) narrated that the Holy Prophet (sallallaahu ’alayhi wa sallam) said:
"And when your leaders do not judge by the Book of Allaah, not seeking the good and welfare with what Allaah has revealed, then Allaah would cause them to fight one another.” [Ibn Majaah 4019]
The Prophet said, in an addition to the second narration:
“Indeed, what I fear for my Ummah are misguided leaders, and that when the sword is drawn out against them, it will not be lifted from them until the Day of Judgement. And the Hour will not come, until sections of my Ummah will follow the mushrikeen (those who worship others along with Allaah), and until many sections of my Ummah will worship idols."
It proves that ruling or judging by other than what Allaah has legislated and revealed is shirk (polytheism) and equals worship of man made laws as idols.
And Allah Knows Best.