As being religious, catholicism has the most traditions, and developed the most extra-biblical doctrines.
Of the additional beliefs is the near deification of Mary.
There is the whole confessional thing, and saying our fathers corrects the sin.
Then the there is the fact priests can't marry.
It end up making a hypocritical faith born on tradition.
Then there is excessive use of of imagory, and tweaking the ten commandments to soften idolatry.
Purgatory is another invented idea, or place.
Then there is the belief that the sacraments and baptism can save your soul.
What I is see is religion in the catholic church, is not an analysis of faith, but what the priest or the pope says.
Then when people understood what was in the bible, and that catholic traditions are extra biblical, the pope issue a new doctrine that says in Latin, tradition over the bible. Thus it is a man made religion.
I know those are a lot of random thoughts, and I did not order them well as I am typing with thumbs.
So I feel that the religion confuses people's search and understanding of God is.
Are there christian sects more religious? Could be, but catholicism is the largest in number.