I think one reason modern normie Catholics and others fall for false ecumenism and delight in interreligious handholding is this:

===
They believe religion is fundamentally about being nice to each other. So most religions promote the same message, serve the same purpose, shoot for the same goal.
===

But the foundation of true religion -- i.e., Christianity, or Catholicism -- is how we respond to the Person of Jesus.

Without that foundation, your nice religion is as impotent and useless to save your soul from hell as the local Rotary Club.