This article analyzes the professional conversions observed towards entrepreneurship of Muslims in quest of Islamic piety in the professional field. If religion is a decisive leitmotiv, these economic actors refer to secular ethics such as sustainable development, ecology, organic, the preservation of future generations or even ethical finance and solidarity savings to explain their conversions. They show concern for fair behavior both towards Islam and towards the world and the society they inhabit and are committed through economic and market activity to alternative modes of consumption and production to conventional capitalism. Appears a figure of an entrepreneur committed towards religion as for the sustainable development, ecology, socially responsible capitalism, etc. trying to respond to the contemporary challenges of societies through religious references and economical activities.