Briefly,
The marriage is an intimate union for life of a man and a woman who are able to achieve the sexual act that can bring children in the children. Children is a gift of marriage, we need to desire them, if we are are still in childbearing years, when we marry. But not all married couples will be blessed.
Why are gay people not allowed to get married if a couple who cannot have children can get married in Church?
Because the 2 situations are VERY different.
In the second, we have a man and a woman. They can have natural intercourse. So, the godly order, which follow the natural order is met.
In the first, we have 2 people of the same sex. They cannot have intercourse because their sexual parts don’t match. There is no complementarity, nor in sexuality, nor naturally as two people of differents sex. Marriage is impossible, the God’s order is not followed. End of the debate.
Please, as this is said, do not compare married people who cannot have children with a “gay” couple. It is offensive to said to them, their marriage must be invalid. First, it is not their fault, second, it is not what the Catholic church said.
We also acknowledge that a gay couple can have the same experience of love that a straight couple has.
Absolutely not.
The question is not to compare an “amount” of love, because love cannot be quantified.
But a man and a woman are different people. Only when we have a man and a woman together, we can have the two versions of humanity that God has create. Man and woman are complementary, as Eve complete Adam after God create her from his own body. The woman is the companion God have give to the man.
It is for theology.
On the psychological level, give a definition of a man and a woman is difficult. But they are not the same. And maternity and paternity reveal it deply, for people who have this experience.
And as sexually, the situation is very different too.
Is it because allowing a gay couple to get married in the church would challenge the use of condoms (I understand the pill is different in this case).
We go to an ugly part here!
I suppose that you said that, because you have statistics in mind on how “gay” couple are not exclusive too each others at a more higher level than “heterosexual” men in a relationship. (a political correct word to say “unfaithfull”). And because of the statistics on the prevalence of HIV and STD among them.
But as this is not a conduct except from a faithfull Catholic, and living an homosexual life is not too, this is not the reason.
It will not challenge the use of condom because a gay couple cannot be married.
A catholic couple who marry engaged themselves to be faithfull.
They are excepted to not use contraception at all. Whether it is a condom, the pill or any other stuff. They should be open to life when they engage in the marital act.