What makes Hinduism's beliefs, particularly its polytheistic nature, complex
for other people?

"Polytheism" the term which is the belief in numerous Gods. So Hindu people are not polytheists as most of them believe that all the Gods and Goddesses are the ultimate reflection of One ultimate power Brahmin . Other aspect of polytheism is the numerous unknown Gods have same status and worshipped concurrently.

biological/genetic factors means they were born or predisposed to have something. nothing can really change it, and you can't really do much to "fix" it. it isn't something learned

these are the biological factors:

adrian is relatively tall and he is on the basketball team

(adrian can't ever stop being tall or force himself to be tall. likely one or both of his parents are tall as well and they passed on the tall gene. he probably does basketball because he is tall)

the rest are environmental/cultural factors. these are things that are taught to us. for example, cynthia wasn't born saving pocket money, her family most likely taught her this (environmental factor)

hope this !