Separation of Church and State -v- Public Library?

An author will give a reading from his recently published book about a specific church and their religion. Is this a violation of the Separation of Church and State law, since it is at a Public Library? If not, must they give equal time to someone to rebut his slanderous opinions of the church and religion? What... show more An author will give a reading from his recently published book about a specific church and their religion. Is this a violation of the Separation of Church and State law, since it is at a Public Library?
If not, must they give equal time to someone to rebut his slanderous opinions of the church and religion?
What would stop the local Library "event planner" to push their own personal agenda by only having talks against a certain religion and church?
Update: P.S. The book is called "The Religion (and Church) of Atheism.
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