Every song has a composer every book has an author every car has a maker every painting has a painter and every building has a builder. So it isn't irrational to take this simple logic a little further and say that nature must have had a Maker. It would be irrational to believe that it made itself.
Great art is as irrational as great music. It is mad with its own loveliness.
Fear of serious injury alone cannot justify oppression of free speech and assembly. Men feared witches and burnt women. It is the function of speech to free men from the bondage of irrational fears.