Modernism claims that all truth and even the revealed dogmas of the Church are to be adapted, changed, and subordinated to the spirit of the modern age. Modernism teaches not simply the development of dogma (where what was believed from the very beginning is made more explicit and taught more clearly as the ages progress), but the evolution of dogma according to which the truth essentially changes for the modern era. Modernism, then, places man at the center of all things and defines truth and reality as subject to man's experience.
Though modernism was condemned over 100 years ago, we see it is still causing confusion in the Church today -- it is modernism which is at the root of Fr Sosa SJ (the superior of the Jesuits throughout the world) heretically stating that the devil doesn't exist as a real person, and it is modernism that leads people to reject our Lord's words in the Gospel that very few are saved.
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The following propositions are condemned by Pope St Pius X in 1907 (Lamentabili Sane) as stemming from the heresy of Modernism
[excerpts]
1. The ecclesiastical law which prescribes that books concerning the Divine Scriptures are subject to previous examination does not apply to critical scholars and students of scientific exegesis of the Old and New Testament.
5. Since the deposit of Faith contains only revealed truths, the Church has no right to pass judgment on the assertions of the human sciences.
9. They display excessive simplicity or ignorance who believe that God is really the author of the Sacred Scriptures.
11. Divine inspiration does not extend to all of Sacred Scriptures so that it renders its parts, each and every one, free from every error.
14. In many narrations the Evangelists recorded, not so much things that are true, as things which, even though false, they judged to be more profitable for their readers.
15. Until the time the canon was defined and constituted, the Gospels were increased by additions and corrections. Therefore there remained in them only a faint and uncertain trace of the doctrine of Christ.
16. The narrations of John are not properly history, but a mystical contemplation of the Gospel. The discourses contained in his Gospel are theological meditations, lacking historical truth concerning the mystery of salvation.
18. John claims for himself the quality of witness concerning Christ. In reality, however, he is only a distinguished witness of the Christian life, or of the life of Christ in the Church at the close of the first century.
19. Heterodox exegetes have expressed the true sense of the Scriptures more faithfully than Catholic exegetes.
27. The divinity of Jesus Christ is not proved from the Gospels. It is a dogma which the Christian conscience has derived from the notion of the Messias.
28. While He was exercising His ministry, Jesus did not speak with the object of teaching He was the Messias, nor did His miracles tend to prove it.
29. It is permissible to grant that the Christ of history is far inferior to the Christ Who is the object of faith.
32. It is impossible to reconcile the natural sense of the Gospel texts with the sense taught by our theologians concerning the conscience and the infallible knowledge of Jesus Christ.
34. The critics can ascribe to Christ a knowledge without limits only on a hypothesis which cannot be historically conceived and which is repugnant to the moral sense. That hypothesis is that Christ as man possessed the knowledge of God and yet was unwilling to communicate the knowledge of a great many things to His disciples and posterity.
35. Christ did not always possess the consciousness of His Messianic dignity.
36. The Resurrection of the Savior is not properly a fact of the historical order. It is a fact of merely the supernatural order (neither demonstrated nor demonstrable) which the Christian conscience gradually derived from other facts.
37. In the beginning, faith in the Resurrection of Christ was not so much in the fact itself of the Resurrection as in the immortal life of Christ with God.
38. The doctrine of the expiatory death of Christ is Pauline and not evangelical.
39. The opinions concerning the origin of the Sacraments which the Fathers of Trent held and which certainly influenced their dogmatic canons are very different from those which now rightly exist among historians who examine Christianity .
40. The Sacraments have their origin in the fact that the Apostles and their successors, swayed and moved by circumstances and events, interpreted some idea and intention of Christ.
49. When the Christian supper gradually assumed the nature of a liturgical action those who customarily presided over the supper acquired the sacerdotal character.
52. It was far from the mind of Christ to found a Church as a society which would continue on earth for a long course
of centuries. On the contrary, in the mind of Christ the kingdom of heaven together with the end of the world was about to come immediately.
53. The organic constitution of the Church is not immutable. Like human society, Christian society is subject to a perpetual evolution.
58. Truth is no more immutable than man himself, since it evolved with him, in him, and through him.
59. Christ did not teach a determined body of doctrine applicable to all times and all men, but rather inaugurated a religious movement adapted or to be adapted to different times and places.
64. Scientific progress demands that the concepts of Christian doctrine concerning God, creation, revelation, the Person of the Incarnate Word, and Redemption be re-adjusted.
65. Modern Catholicism can be reconciled with true science only if it is transformed into a non-dogmatic Christianity; that is to say, into a broad and liberal Protestantism.
