The battle is between the Church and the anti-Church the Church of God and anti-God the Church of Christ and anti-Chris

https://www.ewtn.com/library/HOMELIBR/HERESY7.TXT

the battle  is between the Church and the anti-Church  the Church of God and anti-God the Church of Christ and anti-Christ.
There is a battle on between the retention of Catholic morals, tradition, and authority on the one side, and the active effort to destroy them on the other. The attack will not tolerate us. It will attempt to destroy us. Nor can we tolerate it. We must attempt to destroy it as being the fully equipped and ardent enemy of the Truth by which men live. The duel is to the death.
p146-148

The new advance against the Church, what may prove to be the final advance against the Church, what is at any rate the only modern enemy of consequence--is fundamentally materialist. It is  materialist in its reading of history, and above all in its proposals for social reform.

Being Atheist, it  is characteristic of the advancing wave that repudiates the human reason..

The great Modern Attack (which is more than a heresy) is indifferent to self-contradiction. It merely affirms. It advances like an animal, (spirt of an animal? ed note) counting on strength alone. Indeed, it may be remarked in passing that this may well be the cause of its final defeat; for hitherto reason has always overcome its opponents, and man is the master of the beast through reason.

The Modern Attack in its main character, materialist and atheist and being atheist it is necessarily indifferent to truth. For God is Truth.

Therefore with the advance of this new and terrible enemy against the Faith and the civilization which the Faith produces, there is coming (already here ed note) not only a contempt for beauty but a hatred of it; and immediately upon the heels of this there appears a contempt and hatred for virtue.

The less vicious converts of the enemy, talk vaguely of "a readjustment, a new world, a new order; but they do not begin telling us, as in common reason they should, upon, what principles this new order is to be raised. They do not define the end they have in view.

This Modern Attack professes to be directed towards a certain good, to wit, the abolition of poverty. But it does not tell you why this should be good; it does not admit that its scheme is also to destroy other things which are also by the common consent of mankind good; the family, property (which is the guarantee of individual freedom and individual dignity) humor, mercy, and every form of what we consider right living.

Well, give it what name you like, call it as I do here, "The Modern Attack" or as I think men will soon have to call it "Anti-Christ".

It is not the revolt of the oppressed; it is not the rising of the proletariat against capital injustice and cruelty; it is something from without, some evil spirit
taking advantage of men's distress and at their anger at unjust conditions.

Now that thing is at out gates. Ultimately, of course, it is the fruit of the original break-up of Christendom at the Reformation.

It began with the denial of central authority, it has ended by telling man he is sufficient to himself. and it has set up everywhere great idols to be worshipped as Gods.

It is not only on the communist side (or the progressive left ed note) it appears also in the organizations opposed to them; in the races and nations where mere force has been set up in place of God. These also set up idols to which hideous human sacrifice is paid. By these also justice and the right order are denied.