My feeling is, the Church browbeats us on Mass attendance because, ultimately attending builds us up spiritually, and a lot of folks would otherwise be slackers. I think they are overstating the gravity of non-attendance as a means to a positive end. Protestant churches do this with peer and social pressures.
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And perhaps the Church IS doing this because we’d otherwise be slackers… I suggest that doesn’t matter either way.
“I will give you the keys to the kingdom of heaven. Whatever you bind on earth shall be bound in heaven; and whatever you loose on earth shall be loosed in heaven.” NAB, Mt 16:19
The Church’s rule is binding us on earth, as Jesus promised to Peter. Obedience is of utmost importance in both Old and New Testament, as well as in the ‘early’ Church. I would suggest that your opinion of what is sin (in this case) is an opinion you should strive to disregard. It is a VERY difficult thing to trust the Church’s opinion over your own. But it is a worthwhile goal. We are inclined to sin, and to love to overlook/gloss over our sinful inclinations. This is especially so in our modern age with our emphasis on doing our own thing and what feels right to us.
From another perspective, they removed the required abstinence from meat on Fridays since people should be able to choose another penance. Well, guess what happened. No abstinence, no penance, no notion of any such idea. So sad,
The Church has said that missing Mass is a mortal sin, which separates one from God. If you cannot spend ‘just an hour’ with God (as his Apostles couldn’t in Gethsemane) and don’t think it’s a big deal, I would question whether the 1st Commandment wasn’t being crossed.
I hope I’m not sounding too harsh. I was an atheist for 25 years, and when I came home to God and Church, I realized that if there was a disagreement on Dogma/Doctrine, I was probably wrong and my 2000 year old Church was probably right. It’s not easy to think this way, but there’s a peace in my life now.
If this sounds like too much, then I would going to Confession, praying "I believe, help my unbelief!” (RSV-2CE, Mk 9:24) and leave it in God’s hands.