In the early 1660s some people thought that Van den Enden was an atheist, while others believed that he was a Roman Catholic. In this period, together with Pieter Corneliszoon Plockhoy, he worked on a project for a utopian settlement in New Netherland, more precisely in the area of the present Delaware. Van den Enden's views on this ideal society are found in the "Kort Verhael van Nieuw-Nederland" ("Brief Account of New Netherland", 1662). Some years later, in 1665, another political publication appeared, the "Vrye Politijke Stellingen" ("Free Political Proposals"), in which democracy is defended and attention is paid to the social and educational tasks of a state. In that same year, when the Second Anglo-Dutch War had just started, he wrote to Johan de Witt offering to sell him a secret weapon for the navy.