PAS president Abdul Hadi Awang has questioned the reason certain non-Muslims are attempting to impose the ideologies of westerners such as Karl Marx and Adam Smith instead of their own respective religions.

He also asked non-Muslims to give the Islamic approach a chance.

“Why can't they give the Islamic approach to politics, economy and society, without any compulsion to leave their religions, a try?

"Even if they don't accept it, do not become an obstacle," he added in an open letter to Malaysians.