Why can't Pentecostal Christians date a Catholic?

Roman Catholic AnswerMarriage is a sacrament. The entire Christian life bears the mark of the spousal love of Christ and the Church. Christian marriage in its turn becomes the efficacious sign, the sacrament of the covenant of Christ and the Church. For these reasons and others, particularly the unity and indissolubility of marriage and the begetting and raising of children in the Catholic faith particular attention on the part of couples and the pastors must be paid to mixed marriages (marriage between a Catholic and a validly baptized non-Catholic. Difference of confession between the spouses does not constitute an insurmountable obstacle for marriage, but the difficulties must not be underestimated. 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. According to the law in force in the Latin Church, a mixed marriage needs for liceity the express permission of ecclesiastical authority. (Cf. Code of Canon Law, canon 1124). This permission or dispensation presupposes that both parities know and do not exclude the essential ends and properties of marriage; and furthermore that the Catholic party confirms the obligations, which have been made known to the non-Catholic party, of preserving his or her own faith and ensuring the baptism and education of the children in the Catholic Church. (Cf. Code of Canon Law, canon 1125). (all extracted from The Catechism of the Catholic Church, second edition, English translation 1994)