This from a Catholic:

Paragraph 2181 of the Catechism of the Catholic Church:
“The Sunday Eucharist is the foundation and confirmation of all Christian
practice. For this reason the faithful are obliged to participate in the
Eucharist on days of obligation, unless excused for a serious reason (for
example, illness, the care of infants) or dispensed by their own pastor.
Those who deliberately fail in this obligation commit a grave sin.”
Not that [a mistaken] view isn’t widely held. The last time I tried to confess missing Mass without good reason, the priest would have none of it. After some probing into my state of life (married, children, hectic weekend, etc) the priest concluded that I must have had a dozen good reasons for missing Mass, never mind what my own examination of conscience had led me to believe. Since at this point I wanted to slap the silly man, I simply proceeded to my next sin (having a terrible temper) and let it drop.

And this from a Lutheran:

I’m about to be placed into the parish ministry, and I’m determined, after 5 years or so in part-time parish experience, to spend the first year or so homiletically concerned with our catechism. For teaching purposes, we divide the christian faith into 6 chief parts: the Ten Commandments, the Our Father, the Apostles’ Creed, The Lord’s Supper, Baptism, and Penance. It seems necessary to do this so that I can figure out what weaknesses and strengths a given parish might have in the Faith.
At any rate….there seems to be a move among the clerics across the “catholic” board (except for those poor anglican types), to actually make their people learn the substance of their faith.