The most significant anti-religious and anti-clerical works of the great American satirist Mark Twain (1835-1910) became known to readers only in the early 60s of the XX century. Biblical traditions, Christian dogmas, religious morality, black deeds of the clergy are mercilessly criticized in them. In each work included in this book, a wonderful writer appears as a convinced atheist, humanist, fighter against cruelty, injustice, hypocrisy.