And also there were Crusades
Through word of mouth, religions and stories spread by people sharing the religion until it was written down
Satanism.
since the ancient times
Judaism did in ancient times.
the Holy Land did not spread. If anything, it has shrunk since ancient times.
trade
Through most of their history the ancient Romans had their own religion: Roman Religion. In the Later Empire Christianity spread in the Roman Empire, was endorsed by the Roman emperors and became state religion.
Buddhism
God created the world including science, hence science and religion are interconnected.
Missionaries are the people who help spread a religion.
Hinduism, for the most part, but Jainismin the older times!
HINDUISM - The World's Ancient RELIGION.
They practiced the ancient Egyptian religion.