This work characterizes dualism in Brazilian Protestantism. Based on an analysis of the life and works of Dietrich Bonhoeffer, it presents strategies able to shine some light on the practice of the Brazilian Baptist Church in the country. Firstly, the research problem is presented: the harmful effects of dualism on the spread of the Gospel. The need for an integrated perspective of the human being, one that results in a practice and a theology that consider the inseparability between mysticism (life oriented to the transcendent) and militancy (life inserted and active in the world), is also affirmed. Next, the process and pedagogical strategies through which dualism penetrated Christianity and the formation of Brazilian Baptist theology and doctrine are discussed. Finally, the study of the theological reflection and personal experience of Bonhoeffer aims at gathering ways to articulate spiritual and practical dimensions of Christian life and, therefore, at offering renewed forms of Christian practice that surpass dualism. Out of this study five suggestions are given for overcoming dualism: love for God and the neighbor, insertion of the church in the world, the church taken as a living community, ecumenical vision, and, the ethical dimension of faith.