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Because Islam was protected and is perfect while Christianity started off as true and perfect but was changed as it was passed on.
No, Christianity is still the biggest religion in the world.
This is a tough question, because it is so non-specific. But to understand the answer to your question, you have to understand the relative positions of Islam and Christianity. Although Islam came 6-hundred years after Christianity, it is still Christianity that is the mainstream of human history.
Yes there are still religious groups called the Rightouse like Christianity and Judaism, or Islam.
Judaism, Islam, and Christianity.
The Abrahamic religions which are now Judaism, Christianity, and Islam.
Both Christianity and Islam had limited success in areas where Hinduism and Buddhism were dominant. However, Islam succesfully spread to Malaysia, Indonesia and the Philippines, where animism was still the dominant belief system. The spread of Islam in the Philippines also coincided with the arrival of Christianity. Christianity was successful in the colonised north, while Islam succeeded in the south, which was largely ignored by the Spanish rulers.
As the last Religion following Christianity & Judaism, Islam has always been, and still is, sent down for all Mankind without exceptions.
No God prophet is currently still alive on earth. Last God prophet is prophet Muhammad; peace be upon him; died in year 632 AD.
The largest religious group in the world are Christians. There are over 2,200,000,000 Christians worldwide and the religion is still growing strong. This is almost 1,000,000,000 more than the second largest religion, Islam.
It was, in fact, not a break from the past. Jerusalem is still a sacred city for the Muslims. Islam is the continuation of Judaism and Christianity. The Muslims must believe in all the Prophets (May peace be upon them all). It was the secret wish of the Holy Prophet Hazrat Muhammad SAW that the House of Almighty Allah, built by Hazrat Abraham AS should become the Ka'abah for the Muslims. His wish was granted by Almighty Allah.
The religion of ancient Mesopotamia (approximately = Iraq) was polytheistic. Later Christianity became strong. Later still Islam took over.