Subject should have been
" what happened to Muslim after umer".
Nothing happened to islam, it's a set of teachings and beliefs in a book called Quran which is a constant and won't change.
I agree with Br. Sidqi. [ " what happened to Muslim after umer".------ ]
"I am the punishment of God. If you had not committed great sins, God would not have sent a punishment like me upon you"
The quote comes from the English translation by John Andrew Boyle of The History of The World Conqueror written by the Persian historian Ata-Malik Juvayni in the 13th century.