Hey man
Monotheism or Polytheism
Worshiping one God or many Gods
Worshiping a God with a statue or without a statue
Whatever enters your mind other than God during your prayer is an idol

Meantime worshiping one God or many Gods 
All mankind sin in same amount and in large quantities 

What is the bigger shirk (ascribe) more than being insincere, selfish and proud before your fellowmen