What is the purpose of religion?

There are a myriad of religions and spiritual path all over the globe. I have noticed that most of the Far East religions tend to go on preservation of the culture and society rather than pillage and plunder. Why is that I wondered, and I have come to realisation, that each religion was composed based on the Geographical, Cultural and Mentality of the times. One of the main factors is most of the Far Eastern religions focus more on acceptence, respect, tolerance and adaptation to life's evolution because it is basically imbued within their cultures.

Eg: When Buddhism traveled to Tibet, China and Japan, the deities of the local cultures are accepted and embraced by the community. Buddhism doesn't believe in condemning the local cultural practices of other nations, but serves to adapt, respect and be understanding of them. This is because Buddhism realises that Local practices are very much valued by the people, and if the people is made to serve the religion, failure or conflict is bound to happen... because the religion exists to serve the People... without people to serve... what is the use of Buddhism? Or Christianity? or what ever -isms. What use is there if there is no one to save, or liberate?

Religion is there as a tool for Humanity to find ultimate happiness, and not Humans are there as a Religion's tool to Happiness and material profit.