People who spread religious ideas are called missionaries.
John Calvin's religious ideas were spread to North America from Europe. "John Calvin's Protestant teachings were spread across Europe and into North America."
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The spread of people,ideas,technology and products among plaves
The Middle East spread their ideas by warfare and conquests
The Middle East spread their ideas by warfare and conquests
New ideas spread by people printing and sailing to undiscovered places.
its missionaries
When a people are conquered, but not wiped out, their ideas may spread to the conquerors -- actually, ideas can spread either way. When people trade with each other, ideas may spread. Anytime there is communication, ideas may spread. Building a large wall and keeping anyone from cross it -- that is not a good way for ideas to spread.
forests*
People talk in memes to spread cultural ideas from one person to another.
spread it globably to different people
There are many. Some wanted to dominate land while religious groups wanted to spread culture and religious ideas. Others wanted peace and prosperity. There are more ideas but those were the mist common.