Christianity is the number one world religion by number of adherents. Members of the religion are called Christians. It is a monotheistic religion. It is the largest religion in the world and is based on the life and teachings of Jesus of Nazareth.

Just like Judaism and Islam, Christianity is an Western Religion. Christianity started out as a Jewish sect in the eastern Mediterranean. It quickly grew in number of believers and influence over a few decades, and by the 4th Century it had become the dominant religion in the Roman Empire. The Kingdom of Axum became the first empire to adopt Christianity. During the Middle Ages, the rest of Europe mostly was Christianized. At that time, Christians were mostly a religious minority in the Middle East, North Africa, and parts of India.  Following the Age of Discovery, through missionary work and colonization, Christianity spread to Africa, the Americas, and the rest of the world.

Christianity has been an important part of the shaping of the world. As of the early 21st century, Christianity has approximately 2.2 billion followers

Edited from: https://simple.wikipedia.org/wiki/Christianity

Founder:  

Jesus Christ, who was crucified around 30 CE in Jerusalem

How Many Gods:

Christian are monotheists. So, they believe in one god

Holy Writings

The Bible is the main sacred text of Christianity.

Beliefs

Jesus taught love of God and neighbor and a concern for justice.

Types

In 1054, with the Great Schism, Christians separated into the Eastern Orthodox Church and the Roman Catholic. Church. In the early 1500s the major Protestant groups (Lutheran, Presbyterian, Episcopalian, etc) came into being. A variety of other groups have since developed.

Where

This religion was started in the Middle East.  Through its missionary activity Christianity has spread to most parts of the globe. Governments also played a role in it's spread such as the Roman Empire bringing it much of Europe and later the Spanish Empire bringing it to Latin America.

Edited from: https://www.infoplease.com/world/religion/major-faiths-concise-table