The problem with religion isn't if it's right or not, but how easy it is to be used as a tool of oppression Look at history, religion has always been used to blind the public of corruption.

It was used to keep monarch's in power, oppress woman, gays and the disabled. It was used at as justification to declare war, and to recruit soldiers for it - all in the name of God

It was used to prevent the public from questioning the status quo - which lead to hierarchies. It allowed priests and bishops to get away with doing unspeakable things to children, to tax workers into poverty. It was used as a tool of fear to make people act in a certain manner, and as a way to brainwash the population, and form religious cults, some of which killed minorities.

And it continues to oppress - especially places like the Middle East, Africa and much of the West. 

Personal and organised faith present no harm, but when it is corrupted it acts as a tumour in society.