The Guardian issued a correction to clarify that Irish kids will not in fact be taught that God doesn't exist (though they will learn about atheism):

An article (Ireland gets its first curriculum for teaching children atheism, 27 September, page 35) was amended to clarify that pupils in multi-denominational schools will learn about atheism as part of the wider curriculum covering ethics, beliefs and religion. Atheists will not be teaching children that God does not exist, as originally stated, rather, children will be educated about atheism, including the atheist belief that God does not exist.