College is spreading these people's belief system (10)

I believe the answer is:
polytheism
'system' is the definition.
The definition and answer can be both related to thinking as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'college is spreading these people's belief' is the wordplay.
'college' becomes 'poly' (polytechnic).
'is spreading these people's' becomes 'the' (I am not sure about this - if you are sure you should believe this answer much more).
'belief' becomes 'ism' (the -ism suffix in the names of belief systems).
'poly'+'the'+'ism'='POLYTHEISM'
Can you help me to learn more?
(Other definitions for polytheism that I've seen before include "Belief in more than one god" , "Worship of more than one god" , "worshipping many gods" .)
