Discussing Ss "marriage" And The Start Of Humankind

[1catholic]

I am debating with a friend, this has come up.
I fully support Church teaching, but need to defend, accurately against this question.

1. The Church teaches that Adam and Eve were the first two human beings and from them came all other human beings.

2. Therefore, siblings "married," and this must have been moral since it was necessary and nothing necessary can be immoral

3. Today it is immoral for siblings to marry.

4. Therefore, rules have changed.

5. Why can't gays now marry?


I have talked about gender and all that, but I want to address the difference in the change btw the first persons and the inability for natural law to change (ie no ss marriage)


Thanks!

[cappie]

I'm not too sure this will help.

1) The Catholic Church following the teaching of Christ defines Matrimony as the marriage covenant by which a man and woman establish between them­selves a part­nership of the whole of life-is by its nature ordered towards the good of the spouses and the procre­ation and education of offspring.

For a baptized couple, this covenant has been raised by Christ to the dignity of a sacrament.

Because Christ insti­tuted this sacra­ment, he also gives a man and a woman their vocation to marriage. The covenant thus in­volves not only a man and a woman, but also Christ. In establishing marriage as a vocation in life, God gave it the characteristics that enable human love to achieve its perfec­tion and allow family life to be full and fruitful. Outside marriage, or without a proper realization of its nature, the right conditions for the fruitfulness of human love and for a suc­cessful family life do not exist.

The Catholic Church has the right to establish laws re­gard­ing the validity of marriages, since marriage for the baptized is both a covenant and a sacrament. And it is only the Ca­tholic Church that has jurisdic­tion over those mar­riages, with due regard for the competence of civil au­thority concerning the merely civil effects. No one other than the Church has the power or authority to change ecclesiastical laws.

2) The natural structure of human sexuality makes man and woman complementary partners for the transmission of human life. Only a union of male and female can express the sexual complementarity willed by God for marriage. The permanent and exclusive commitment of marriage is the necessary context for the expression of sexual love intended by God both to serve the transmission of human life and to build up the bond between husband and wife (see [i]CCC,[/i] nos. 1639-1640).

In marriage, husband and wife give themselves totally to each other in their masculinity and femininity (see [i]CCC[/i], no. 1643). They are equal as human beings but different as man and woman, fulfilling each other through this natural difference. This unique complementarity makes possible the conjugal bond that is the core of marriage.

3) For several reasons a same-sex union contradicts the nature of marriage: It is not based on the natural complementarity of male and female; it cannot cooperate with God to create new life; and the natural purpose of sexual union cannot be achieved by a same-sex union. Persons in same-sex unions cannot enter into a true conjugal union. Therefore, it is wrong to equate their relationship to a marriage.