* Can gay couple, cohabitating or married, be in the state of grace?
Yes. Some objective mortal sins are not also actual mortal sins, due to a lack of full knowledge of the grave immorality of the act. God judges each person based on their own conscience.
* Can an LGBT person go to Heaven, if they die without repenting of their objectively grave sins?
Yes. Everyone who loves others, truly and selflessly, is in the state of grace and on the path to Heaven. There are certainly many LGBT persons who love others and so are in the state of grace. However, God is the judge over every soul, and not everyone is in the state of grace.
* Is it a sin for a Catholic to attend a gay wedding?
Not always. Attendance does not necessarily indicate approval for the particular union, nor for same-sex marriage in general. If your friend or family member is getting married, it is not intrinsically evil for you to attend, though you should avoid scandal by making it clear that you believe what the Catholic Church teaches.
* Is it a sin for a Catholic to provide services for a gay wedding?
Not usually. Providing cake, catering, music, flowers, photography, venue, or other services to a same-sex wedding is not intrinsically evil, since the acts of the person providing those services are not inherently contrary to the love of God and neighbor. Providing those services does not indicate approval for the particular union, nor for same-sex marriage more generally, nor is it a type of formal cooperation. Providing those services is remote material cooperation, and so it can be moral (depending on intention and circumstances).
* Is it a sin for a Catholic to officiate at a gay wedding?
Yes. Performing the marriage ceremony itself expresses approval for same-sex marriages. Therefore, this type of act is formal cooperation with the same-sex wedding. It is a sin of perpetration, not merely cooperation, since the person who officiates is either simulating a Sacrament (in some cases), or falsely declaring a (non-sacramental) marriage.
* Is it a sin for judges or other government officials to perform same-sex marriages?
If their primary role is not officiating at same-sex marriages, and they function merely to recognize a legal marriage, it is not necessarily a sin for them to officiate or to issue the marriage license. For they are stating that the State recognizes the marriage, which it does, and they are not personally stating any position on the topic. However, they should avoid officiating at same-sex weddings, unless absolutely required by their job.
* Are sexual acts between persons of the same sex intrinsically evil and always gravely immoral?
Yes. These types of sexual acts are contrary to natural law and are therefore termed unnatural sexual acts in Catholic moral teaching. These acts are unnatural because they are not inherently procreative. They are also not the type of union intended by God for human persons, so these acts are also not inherently unitive (even if the acts include a type of mere physical union). And since two persons of the same sex cannot be joined in a natural or sacramental marriage, the sexual acts are also non-marital.
The only moral sexual act is natural marital relations open to life. To be moral, each and every sexual act must be marital, unitive, and procreative.
* Are unnatural sexual acts between a Catholic husband and wife intrinsically evil and always gravely immoral?
Yes, for the same reasons. These acts are neither procreative, nor truly unitive.
Each and every sexual act in a marriage needs to be open to the possibility of conceiving a child. Even if the spouses are infertile (for some reason beyond their control), they can only morally engage in sexual acts that are inherently ordered toward the marital, unitive, and procreative meanings of the act. Unnatural sexual acts do not become moral if used between a husband and wife, or if used for the purpose of foreplay, or if used in a difficult circumstance. Unnatural sexual acts are intrinsically evil and always gravely immoral. The Catholic Sacrament of marriage does not transform intrinsically evil acts into acts that are good or moral.
* Who sins more: a same-sex married couple, or Catholic spouses using abortifacient contraception and unnatural sexual acts in their marriage?
The latter sin more. Their use of abortifacient contraception kills their own children in the womb, while the same-sex couple use neither contraceptives nor abortifacients. And the use of unnatural sexual acts by the Catholic spouses is more sinful, since it offends, not only by the deprivation of the unitive and procreative meanings, but also as a sacrilege against the Sacrament of marriage.
* Should LGBT persons be permitted to receive Communion, if they are in good conscience?
Current discipline permits divorced and remarried persons to receive Communion, if they are in good conscience. A consistent discipline would then also permit any Catholic to receive Communion, on the same basis, including cohabitating persons, gay couples, and anyone guilty of an objective mortal sin, who does not believe that these acts are grave sins. However, I disagree with current discipline.
My preference for discipline is that persons who are guilty of any objective mortal sin should not receive Communion, until they repent and confess. But this discipline would have to be consistent across all types of sin, including every kind of sexual sin, contraception, abortifacients, abortion, heresy, schism, and so on. If such a discipline were enacted and followed, the vast majority of Mass-going Communion-receiving Catholics would no longer be able to receive Communion. Most are guilty of heresy, at least objectively. Most are guilty of sexual sins and/or contraception. And many other grave sins are also far too common among Catholics in the pews. And they are manifestly unrepentant. The lines for Communion are long, and the line for Confession is short.
Please take a look at this list of my books and booklets, and see if any topic interests you.