 Soon, however, he became sceptical and exhibited decided leanings towards pantheism.From an orthodox Protestant he gradually became a bitter enemy of Christianity, which he attacked in a number of writings and for which he strove to substitute a new religion "of love and peace", formulated in his work "Religion des neuen Weltalters" (Hamburg, 1850).Karl Marx and Frederick Engels joined in writing a critical review of Daumer's "Die Religion des Neuen Weltalters" in January through February 1850 which was published in the "Neue Rheinische Zeitung