Well, why not a study of how many Protestants vs. Catholics practice the Rosary, or the Sacraments, Holy Eucharist, Adoration, Feast Days, etc., etc.
Again, the point arises. It’s in the title. It isn’t about whether Catholics and Protestants ‘practice faith’ more or less than each other - but in the difference of the ways they practice.
To use Bible Study as a measure of quantity or quality of the practice of one’s faith is, I maintain, a false measure.