When the Mon civilization of Southeast Asia was replaced by the kingdom of Pagan, Buddhism was made the official religion of the kingdom.

Neither Christianity nor Islam were designated the official religion of the Pagan kingdom.

Communism had not been theorized yet.

Although some Buddhists consider their faith nontheist or atheistic, Pagan was not official atheist.

Ruling Mongol elites of the Yuan dynasty came into contact with Tibetan Buddhism soon after the state's establishment. 

Ghengis Khan, the most powerful Mongol leader in history, had both Christians and Muslims in his own family; although he personally worshipped Tengri, the sky god. 

The Mongols did come into contact with the Egyptian Mamelukes, but not the Mongols who created the Yuan dynasty in China; rather a different Mongol horde set out westward and invaded the Middle East.

Tonpa Shenrab founded Bon, a Tibetan religion very similar to Buddhism in many ways; in fact Shenrab is often depicted in Bon art as the same as Shakyamuni, or the founder of Buddhism.

Many scholars of comparative religion consider Sikhism, founded by Guru Nanak, a synthesis of Islam and Hinduism.

Siddhartha Gautama, Shakyamuni, an ancient prince from modern Nepal/northern India, is credited with founding Buddhism.

Karl Marx wrote books on the destruction of the aristocratic class, and a coming conflict between workers and capitalists, or the proletariat and the bourgeois.

In some forms of Rastafarianism, Haile Selassie is considered a messianic figure.

Sikhism is oftentimes described as a synthesis, or combination, of Islam and Hinduism; it therefore postdates both Islam and Hinduism.

Hinduism is thousands of years older than Islam.

Hinduism is older than Jainism.

Christianity predates Sikhism.

Judaism predates Sikhism.

The Knights Templar and the Knights Hospitaller were militant religious groups that fought for Christendom (and their own personal wealth) during the Crusades. Both groups became immensely rich and powerful following the conquest of Jerusalem in 1099, during the First Crusade. They continued to fight in European wars, particularly against the forces of Islam, for several centuries.

The word Islam means submission or surrender in reference to whom Muslims believe to be the one true God, Allah. Islam was created in the predominantly polytheistic society of Mecca on the Arabian Peninsula. Surrendering to a monotheistic God was a radical concept that quickly attracted many followers placing their unwavering faith in Allah. Islam is also derived from the root word 'salam' which can mean peace and safety.

After the death of the Prophet Muhammad, Islam spread rapidly around the Middle East, Central Asia, North Africa, and the Iberian peninsula. Within one hundred years of the death of the Prophet Muhammad, Islam was the dominant force in territory as far apart as Spain and Iran.

Zoroastrianism was the state religion of the classical Persian Empire and was widely practiced in the Middle East (particularly modern-day Iran) until the Islamic conquest of Persia in the seventh and eighth centuries.

The repeating patterns found in most early Islamic art and architecture are usually attributed to Islam's unwillingness to depict the prophet Muhammad, which led to a distinctive style devoid of iconography. As such, Islamic art was a dramatic departure from that of Christian churches, although the mosque in Corboda was eventually converted into a cathedral after the end of Islamic rule.

The initial spread of Islam, in the turbulent years after the death of the Prophet Muhammad, was mostly carried out through violent conquest. But, in the many centuries since, the bulk of the spread of Islam has been undertaken along trade routes. Arab traders brought Islam to India in the seventh century and spread the religion deep into Sub-Saharan Africa and Central Asia over the next several centuries.