Paulo Freire's educational theory is world widely acclaimed and recognised for its intrinsic humanism. Here I will present a lesser known face of Freire that I claim is as important as his humanist inspiration: his Catholic background. As a first step, I will present some aspects of Freire's religious experience. Then, I will highlight two aspects of his educational theory showing the connections with his Christian background: the theology of communion in relation to his concept of humanity and the application of the theological virtues as the basis for his concept of dialogue, which, as was shown, are the bases of his educational theory. Finally, I will explore some aspects of the ecclesiology that he was taught and which he later criticised. This research fills not only a gap in Freire's interpretation, but it is also a source of motivation for Catholic educators; those who educate from their beliefs.