I read and hear this all the time - ''strict protestant upbringing''.
And yet, as I look at the respective theology and practices, it seems to me Catholicism, traditional Catholicism, is much more demanding than Protestantism of any kind.
That is because Catholicism admits of so many sacraments. Going to the Church and receiving holy communion isn't merely some sign of faith, it's literally God granting you grace, bit by bit, it's a sacrament required for salvation. A Catholic, slowly, after years of going to church and receiving holy communion, becomes saved. It's not, like evangelical protestantism, a one time event where you're saved by grace through faith alone, etc.
There are other examples like praying the rosary or Latin masses (unless your mother tongue is Latin which was pretty rare post-medieval times) which are let's say extra work one has to do if they're traditionally faithful Catholics. I imagine you must be very disciplined to follow all these practices?
So religion-wise, traditional Catholicism seems to me to be more demanding of discipline so why is protestantism and puritanism linked to strictness and discipline but catholicism isn't?