To what factors would you attribute the decline of religious practice in Europe?

Narcissism.

Read America Alone: The End of the World As We Know It, by Mark Steyn.

The end of times is approaching.

The horrible changes within the Church, Russian controlled infiltration of the Church by committed communist agents, the orchestration of Vatican II "council" which brought only more silence of the Church hierarchy about the most imminent threat of Russian communism.

This silence is today demonstrated by the total disregard on part of the Church of this Russian communist world-wide revolution, which will begin soon.

In the words of the highest-ranking ever defector from the Soviet Bloc Czechoslovak Genaral
Jan [that's John in English] Sejna, in his book "We Will Bury You", outlining this plan,
he pointed out to the following:

"The Soviet Strategic Plan for the establishment of their 'Socialism' worldwide, without a doubt exists and however flexible and pragmatic Soviet policy appears, it is essentially directed towards the achievements of the
Plan's objectives - objectives which have been, are and will remain utterly inimical to and subversive of the freedoms enjoyed by the states of the Western world.

page 107

The main strategic purpose of Phase Three, 'The Period of Dynamic Social Change', was in the words of the Soviet directive, "to smash the hope of false democracy" and bring about the total de-moralization of the West. Our relationship with the United States would be the vital element in this phase.

By fostering belief in our policy of friendship and cooperation with America, we planned to receive the greatest possible economic and technological help from the West, and at the same time convince the capitalist countries that they had no need of military alliances.

Another cause for concern is that many people in the West including some of its leaders do not understand the real significance of the détente to the Soviet Union.

When, along with other Czech leaders, I met Brezhnev in Moscow in 1966 to discuss détente and these were his words:

""Some Left extremists misunderstand détente. They think we are surrendering to the Capitalists.
They don't understand that it gives us a free hand - a free hand to almost all the Communist movements in the World,
and this is most important."
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But the overall reason of decline of Catholic Faith is the acceptance on part of such souls of the worldly pleasures and hedonistic lifestyle, where God is pushed aside as if He did not exist, and these souls, ungrateful to our Lord, are not willing to dispose themselves to receive the grace of God which He wants to give them, so that they may be saved.

This is the main reason why the horrible chastisement that is coming [from Russian run communist slavery], is God's punishment of such people, this is why our Lord asks when He will come back, whether there will be any faith left, this is why we are today where we are, and this is why not a soul is prepared to defend the Holy Mother Church and the Catholic Apostolic Faith from the communist danger and possible destruction [not in full, but almost in full].

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What must Catholics do against Russian led Communism...?

The Holy Mother Church has already provided us with Her guiding principles,
all we have to do is follow them. Here they are:

In his encyclical Firmissimam Constantiam "Catholic Action Plan for Mexico - Mexico's religious situation", [about the Russian organized communist persecution of the Church in Mexico] published March 28, 1937, His Holiness Pope Pius XI gave the following guidance to all Catholics [taken from the book 'Social Wellsprings", Imprimatur Moses E. Kiley, Archbishop of Milwaukee, The Bruce Publishing Company, 1942, pg. 385]:

"....it must be admitted that for Christian life to develop itself it must have recourse to external and sensible means; that the Church, being a society of men, cannot exist or develop if it does not enjoy liberty of action, and that its members have the right to find in civil society the possibility of living according to the dictates of their consciences.

Consequently, it is quite natural that when the most elementary religious and civil liberties are attacked, Catholic citizens must not resign themselves passively to renouncing those liberties.

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You have more than once recalled [Venerable Brethren - ed. note] to your faithful that the Church protects peace and order, even at the cost of grave sacrifices, and that it condemns every unjust insurrection or violence against constituted powers.

On the other hand, among you it has also been said that, whenever these powers arise against justice and truth even to destroying the very foundations of authority, it is not to be seen how those citizens are to be condemned who unite to defend themselves and the nation, by licit and appropriate means, against those who make use of public power to bring it to ruin."
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The last question:

How many of you pray the Rosary daily ?

How many of you have accepted the horrible "new mass" of the Giovanni B. Montini [later Pope Paul VI], who was thrown out of the Vatican Secretariat of State by the Pope Pius XII because of Montini's contacts and dealings with the KGB [back then NKVD] and Moscow communists ?

How many of you think communism is dead ?

How many of you believe that heretics [Protestant etc.] and infidels [Muslims for example] can be saved, contrary to the dogma of the Church [Eugene IV at the Council of Florence, 1448 - not sure about the exact year..] ?

How many of you are ashamed to make the sign of the Cross and thank our Lord in prayer before and after the meal you eat in restaurants ?

How many of you think that it is O.K. to believe what you want to believe and to disregard what you want to disregard, regardless whether the Holy Mother Church taught it or not, and how many of you have chosen to accept the [already condemned - St. Pius X - Pascendi Dominici Gregis] "new doctrines" of modernism [in reality Moscow orchestrated and installed scheme to pervert the teaching of the Holy Mother Church - first established by the then chairman of the Italian Communist Party Antonio Gramsci] ?

How many of you think that God will let you slide and allow His Church to go down just because you have chosen to lead less strict lives and have accepted the lies of communists that the threat of Russian etc. communism is no more ?

Yes, this is the reason why Europe and the whole world [including America] is about the taste the communism slavery for real, this is the real significance of the message of Fatima [approved by the Church in 1931 as being genuine from God].

Get ready, go back to Catholic tradition [or otherwise you are outside the Church, because the Church is where the truth is and not with heretics], and prepare to fight the Holy Crusade against this satanic communist scourge, because that's the only way out and God commands it [Apoc. 13:9-10].

May God guide your steps to salvation, but many of you probably will not make it, unless these kind of warnings are heeded and acted upon.

In Christo et Maria

yours truly