Islam followers say 

Associating partners with Allah is an unpardonable sin which God cannot forgive

They say God can pardon all other sins man do repeatedly as a routine but not shirk (associating partners)

It appears that GOD dont mind man committing evil to his fellowmen

When I am insincere I deny Allah (God) and associate shaitan

when I am pretentious I deny Allah (God) and associate shaitan

When I am selfish I deny Allah (God) and associate shaitan

when I am proud I deny Allah (God) and associate shaitan

when I am greedy I deny Allah (God) and associate shaitan

when I am grand in attire I deny Allah (God) and associate shaitan

when I am egoist I deny Allah and associate shaitan

I dont have to physically worship a statue or another God to commit a shirk 

Meantime what is the bigger shirk than being devious, selfish, greedy, proud and being ego to your fellowmen

Meantime can negative energies be eliminated through pardons