CATECHISM OF SAINT PIUS X
Those Outside the Communion of Saints
10 Q. Who are they who do not belong to the Communion of Saints?
A. Those who are damned do not belong to the Communion of Saints in the other life; and in this life those who belong neither to the body nor to the soul of the Church, that is, those who are in mortal sin, and who are outside the true Church.
11 Q. Who are they who are outside the true Church?
A. Outside the true Church are: Infidels, Jews, heretics, apostates, schismatics, and the excommunicated.
13 Q. How can the Church of Jesus Christ be distinguished from the numerous societies or sects founded by men, and calling themselves Christian?
A. From the numerous societies or sects founded by men and calling themselves Christian, the Church of Jesus Christ is easily distinguished by four marks: She is One, Holy, Catholic and Apostolic.
24 Q. To be saved, is it enough to be any sort of member of the Catholic Church?
A. No, to be saved it is not enough to be any sort of member of the Catholic Church; it is necessary to be a living member.
25 Q. Who are the living members of the Church?
A. The living members of the Church are the just, and the just alone, that is, those who are actually in the grace of God.
26 Q. And who are the dead members?
A. The dead members of the Church are the faithful in mortal sin.
Scripture calls sodomites dogs.
Deuteronomy 23:18
You shall not bring the fee of a prostitute or the wages of a male prostitute[ a dog, sodomite] into the house of the Lord your God in payment for any vow, for both of these are abhorrent to the Lord your God.
Deuteronomy 23:17
None of the daughters of Israel shall be a temple prostitute; none of the sons of Israel shall be a temple prostitute.
That is why Revelation 22:15 says that dogs stay outside the Kingdom of God.
Revelation 22:15
Outside are the dogs and sorcerers and fornicators and murderers and idolaters, and every one who loves and practices falsehood.