From 580 CFRA, "Canadian bishops say the issue will be raised as part of a larger discussion on the worthiness of Catholics who present themselves for the sacrament".
This is a very dangerous situation. Before I continue let me clarify my stance of homosexuality. My views are coloured by my religion. And Islam has unequivocally banned homosexual relations, just like Christianity and Judaism. Many so-called liberal Christians and Jews say their religion has no such law. Not knowing that much details of the religions I cannot clarify, but in Islam it is said the people of Lut (Lot in the Bible) were punished because they practiced same sex relations. The Qur'an chapter 26 verse 165 also spells out what God thinks of gay people.
Therefore I think gay people are wrong. But that does not mean I start burning them at stake or spraying homophobic graffiti. Allah has also said not to transgress in our actions and live peacefully with those whom we disagree on articles of faith.
"He who hurts a dhimmi (minority) hurts me, and he who hurts me hurts and annoys Allah," says a hadith of the Prophet Muhammad (peace be upon him).
"O mankind, we created you from a single pair of a male and female and made you into tribes and nations that you may know one another (not that you may despise one another). Verily the most honoured of you in the sight of Allah is he who is most righteous of you. And Allah has full knowledge and is well aware of all things."
-- The Qur'an (49:13)
Not that this hasn't stopped persecution of gays in some Muslim/non-Muslim countries.
Now we come to the Vatican. From my understanding of Catholicism, communion in the church signifies a physical union with body and blood of Jesus (called Isa in Islam - peace be upon him). This service, performed repeatedly, identifies the worshipper as Catholic and deserving of God's grace in the hereafter. Denial of such a service means the person is barred from the church and cannot be guaranteed of heaven. More details here.
Now I may not agree with another mortal man telling me my spiritual eternity is doomed, but many Catholics do. And many important politicians in positions of power, such as our Catholic prime minister, also believe so.
Even though I do not agree with same sex marriage, I believe it is Canada and Canada's business only as to what we pass as laws in our country. And those laws should also be secular and not based or coloured by any religion. If the Parliament of Canada chose to pass same sex marriage, it is our business and not the Vatican's. And if you say the Vatican is only doing what is in its power to promote its church's teachings, consider this.
At one time in Canada a Protestant and Catholic could not marry (just like it is in some parts of Ireland). And any politician who tried to break this law was threatened by the Vatican much in the same way proponents of same sex marriage are being threatened today. And to those who say the Church is infallible let's not forget Galileo.
If today the Church can dictate same sex marriage, what will they dictate tomorrow. And opponents of same sex marriage have to bring scientific proof as to why it is not valid, other than saying "God does not will it." Something like linking AIDS and same sex.