all that's missing is nation/land and religion to describe the essential parts of a culture itself...

how could religion of a people with particular language and land allow for another religion to be adopted that tries to destroy the original one and its practicioners?

the way you put it, it seems like religion wouldn't be a part of the people... before christianity, the yoruba people would've practiced SOMETHING right? (ifa) so why was christianity so easily converted to in their particular case?