You cannot "abolish" religion. It's not like there's just some "Religion Act" floating around just waiting to be repealed; and then just like clockwork everyone turns into an atheist. It would involve mass persecution, probably genocide, propaganda, manipulation, and oppression. Atheists wont mind.
Effects are the products of causes. Imagine if workers tore down a factory that treated employees poorly. The factory is an effect of the unwillingness of society to treat their workers fairly. Unless the underlying cause is changed, another factory will be built. Religion is an effect of a case.
Religion is just a term to group various models of understanding. It is not possible to abolish certain types of cognition; the best we can do toward the premise is better education. Which is why religion in general continues to wane in 'developed' countries.
Freedom of religion is a fundamental right of all people. Religion is a personal belief, and people should be allowed to follow what they believe to be true in their own hearts. It is not only an important part of our history as a civilization but a necessity in the pursuit of happiness for many.
The scope of such a task should be kept in mind, as abolishing religion would imply removing hundreds and hundreds of religions and variants of religion from billions of people across all of the planet.
But abolishing religion is equatable to abolishing a certain culture. Statements made about discrimination based on sex, race, social status, etc. also include religion. Therefore abolishing religion would be a form of discrimination.
We can know through logic and psychology with good certainty that the concept of a "creater" or a "god" is a human idea. The only reason we believe in all nonsense is because we're taken advantage of at a very vulnerable and young age.