Modernism is the current heresy. It is every bit as bad as Arianism. See Pope St Pius X.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
You may be interested in taking a look at this video clip, which is one of the last celebrations of the Latin Mass by Fr. George Rutler at The Church of Our Savior, Manhattan, before Cardinal Dolan reassigned him to another parish in "Hell's Kitchen".
"Perhaps the last saying of Latin Mass by Fr. Rutler at Church of Our Savior, Manhattan"
You can read about Fr. Rutler's reassignment, and the apparent bad fruits of that reassignment in these articles and comments:
"Fr. George Rutler Moved from Our Saviour to St. Michael’s"