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If the Romans had never allowed the Christianity in the empire, Europe would be pagan.
Without a strong organized religion, the Europeans would be more tolerant with other religions.

During the Middle Ages, the Muslims would invade the Iberian Peninsula and nobody would fight to expel them. It would make it easier to spread the Islam to France and UK.
In the East, the Byzantine Empire would adopt the Islam and spread it to Eastern Europe and it will later reach Russia.

Later, the Iberian Peninsula would invade Latin America and spread the Islam there. France and UK would do the same in North America, Africa and Australia. UK would make India, which was partially Islamic, even more Islamic.

The protestant reform would be Islamic. They would review the philosophy of Al-Ghazali and allow the development of science and technology again making the Industrial Revolution possible and keeping the Islamic faith.

A strong Russian Jihad would prevent the Communism Revolution in Russia. The atheist thought would be forbidden.

After the last destructive war (WWII), which made the superpowers stop entering into war against each other because of the power of their weapons, almost the whole world would be Islamic and it would not be normal to follow another religion. Consequently, the universal declaration of human rights would follow the Islamic law.

France would impose the Islam in Indochina and Africa during the French rule.
The Americans would defeat Japan in the war and impose the Islam there. The Chinese areas conquered by Japan would be occupied by the Americans and they would spread the Islam there and in the rest of China during a time in which China was not a superpower.
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