Fr. John Hardon, S.J. On The Incompatiblity Of Yoga And Hinduism With Catholicism

Yoga is incompatible with Catholicism because the best known practice of Hindu spirituality is Yoga. “Inner” Hinduism professes pantheism, which denies that there is only one infinite Being who created the world out of nothing. 

This pantheistic Hinduism says to the multitude of uncultured believers who follow the ways of the gods that they will receive the reward of the gods. They will have brief tastes of heaven between successive rebirths on earth. 

But they will never be delivered from the “wheel of existence” with its illusory lives and deaths until they realize that only “God” exists and all else is illusion (Maya).

Link (here) to read the full explanation by Fr. John Hardon, S.J. at Patrick Madrid's blog
Painting of Shiva and Ganeshji (here)