Accordingly, the rules for involvement on the part of practising Christian parents must be supplemented with other considerations in the case of "families with little faith or non-Christian families". If these request that a child of theirs be baptised, there must be assurances that the child will be given the benefit of the Christian upbringing required by the sacrament. Examples of such assurances are "the choice of godparents who will take sincere care of the child, or the support of the community". If there is satisfactory assurance, i.e., "any pledge giving a well-founded hope for the Christian upbringing of the children", then "the priest cannot refuse to celebrate the sacrament without delay, as in the case of children of Christian families". If there is insufficient assurance, "it will be prudent to delay baptism", while keeping contact with the parents in the hope of securing the required conditions for celebrating the sacrament. As a last resort, enrollment of the child in a course of catechetical instruction on reaching school age can be offered in lieu of immediate celebration of baptism. The possibility of delaying infant baptism in the case of non practicing or non believing parents raises a number of questions. How can we discern that there are guarantees of an authentic Christian education? Can a priest propose an alternative celebration in the case where baptism is to be delayed? In some German speaking countries, bishops have opened the door to a "two step baptism", i.e. two celebrations separated by a time of evangelization of the parents. In this case, the rite of baptism itself is to be performed in the second celebration, when parents are supposed to have enough maturity to raise the child in the Catholic faith.