The Catechism of the Catholic Church (no. 1633) insists on the difficulties which can arise in the case of mixed marriages (between a Catholic and a baptized non-Catholic), and even more so when there is disparity of cult (a marriage between a Catholic and a non-baptized person). The Catechism goes on (1634): "Differences about faith and the very notion of marriage, but also different religious mentalities, can become sources of tension in marriage, especially as regards the education of children. The temptation to religious indifference can then arise" - especially among the children, who will have to grow up in a secularized world without the support that comes from a home united in faith.