Last Friday, Michael Hichborn gave an online address regarding the heresy of modernism. Pope St Pius X and Pope Leo XIII repeatedly warned against that poison. It has found its way into the thinking of Catholics, many of them well-meaning. I'd suggest a careful listen, particularly to my friends involved in charismatic circles, as I once was. The over-emphasis on subjective experience was one trait of that movement that eventually led me to part ways with it. (In the video, take note starting at 37:15.) Even so, I didn't realize how insidious it is, until I heard Hichborn's reasonings.
Genesis of modernism is materialism. For the modernist/materialist, science takes precedence over Church Teaching. If there is a conflict (real or perceived) between science and Church teaching, then they will attempt to alter Church teaching to conform with their take on scientific pronouncements. What is perceived by the senses informs their adherence to Teachings.
With their focus on the "here and now" (because eternity is beyond the realm of science), we understand the basis of the erroneous focus of most of the "social justice" activists in the Church on their various issues, while denying the right to life of the unborn and the serious nature of sins against the Sixth and Ninth Commandments.
Hichborn recommends (and held up) a book called "A Catechism of Modernism". The author is Father J.B. Lemius. It is available on Amazon. The encyclical of Pope St Pius X can be found here.
Please watch all the way through.