The heresy taught by the Catechism is known as Indifferentism - that is, the belief that one is free to choose other religions, since salvation can be found in them all.
CCC, 821: Certain things are required in order to respond adequately to this call [to unity]:…prayer in common…fraternal knowledge of each other.
These ecumenical meetings are condemned by Scripture:
A man who is a heretic, after the first and second admonition, avoid, knowing that such a man is subverted and sins, being condemned by his own judgment (Tit. 3:10-11).
If any man come to you and bring not this doctrine, do not receive him into the house nor say to him: “God speed you.” For, he who says to him “God speed you” communicates with his wicked works (Jn. 1:10-11).
Moreover, the Council of Carthage declares:
One must neither pray nor sing psalms with heretics, and whosoever shall communicate with those who are cut off from the communion of the Church, whether clergy or layman: let him be excommunicated.
Of ecumenical meetings, Pius XI declares:
…nor is it in any way lawful for Catholics to give to such enterprises their encouragement or support…To favor this opinion [ecumenism], therefore, and to encourage such undertakings is tantamount to abandoning the religion revealed by God (Mortalium Animos).
This type of meeting, incidentally, merely smuggles into the Church one of the most basic features of the Masonic Lodge: fraternal meetings between people of different religions in a spirit of Indifferentism.
SECULAR COLLABORATION AND COMPROMISE
CCC, 821: …[also required is]…collaboration among Christians in various areas of service to mankind. “Human service” is the idiomatic phrase.
Again, this Freemasonic concept of fraternal association outside of the banner of the Kingship of Christ and His Church has been condemned by Pope St. Pius X in his Apostolic Mandate on the “Sillon,” which was just such an organization. He writes:
We fear that worse is to come…the beneficiary of this cosmopolitan social action, can only be a Democracy which will be neither Catholic, nor Protestant, nor Jewish. It will be a religion…more universal that the Catholic Church, uniting all men to become brothers and comrades at last in the “Kingdom of God.” “We do not work for the Church; we work for mankind!” This organization…has been harnessed in its course by the modern enemies of the Church, and is now no more than a miserable affluent of the great movement of apostasy being organized in every country for the establishment of a One-World Church which shall have neither dogmas, nor hierarchy; neither discipline for the mind, nor curb for the passions…under the pretext of freedom and human dignity.
One might also note that “freedom” and “human dignity,” as well as secular collaboration, are not only trademarks of Freemasonry, but are also hallmarks of the “pastoral” Vatican II Council: a Council which lacked, according to Pope Paul VI, infallibility. As the Pope said:
There are those who ask what authority, what theological qualification the Council intended to give to its teachings…The answer is known by whoever remembers the conciliar declaration of March 6, 1964, repeated on November 16, 1964: Given the Council’s pastoral character, it avoided pronouncing, in an extraordinary manner, dogmas endowed with the note of infallibility.
We might add that what is not infallible can obviously be wrong - and where it conflicts with prior infallible Church teaching, it simply is wrong.
CCC, 2358: The number of men and women who have deep-seated homosexual tendencies is not negligible. They do not choose their homosexual condition…
This statement is indeed difficult to square with the teaching of Pope Alexander VII, who declares:
Sodomy and bestiality are sins of the same ultimate species…
Is it also true that tendencies toward bestiality are not chosen as well? In contrast to the statements of the new Catechism (which clearly panders to the recent propaganda from the homosexual lobby), the Bible puts the entire blame for such sins on the people themselves, who first turn away from God and idolize the things of this world:
Who changed the truth of God into a lie; and worshipped and served the creature rather than the Creator, who is blessed for ever. Amen. For this cause God delivered them up to shameful affections. For their women have changed the natural use into that use which is against nature. And, in like manner, the men also, leaving the natural use of the women, have burned in their lusts one towards another, men with men working that which is filthy, and receiving in themselves the recompense which was due to their error (Rom. 1:25-27).