Wo bitte geht's zu Gott? fragte das kleine Ferkel by Michael Schmidt-Salomon kaj Helge Nyncke is a famous German antireligious children's book.
An English translation of the text is downloadable: Which is the Way to God, Please? Little Piglet Asked (A book for all those who won't let themselves be fooled), translated by Fiona Lorenz.
Click here for (a slideshow of) the illustrations.