> I agree, religion offers simple ways to classify actions as good or bad. Following the church teachings or priest's guidance was enough to make an individual confident they are a good person, doing good things.
The unfortunate thing is that this sums up the current state of religious education because we've had a generation that was poorly taught, who then taught the next generation. Now the generation we are raising is not even being taught - which might actually be a good thing since those that are interested will seek that knowledge for themselves instead of being turned off by poor educators.
But for Catholic moral theology for example, it's generally quite complex and exceedingly individual for all but the most black and white situations. What is a sin for me, may not be for you. "Sin" is also in itself a catchall for a whole subset of types of sin - and they're almost all relative to the individual because it will depend on the extent of your free choice, your understanding, and the gravity of the situation. People think it's the 10 Commandments, but that's really just the one thing someone who was poorly educated would remember.
And it's quite tragic because it's actually a whole journey that begins with natural law. Then slowly, over generations, you get small revelations of what God's moral teaching is until you reach a big moment with the revelation of Mosaic law (part of which are the 10 Commandments). Then generations later, you have Jesus drop by and quite literally say that because you were too hard of heart, that was the law revealed to you, but that now you are ready for a higher moral standard.
Even if one has no interest in Catholicism, it's fascinating to watch from the perspective of the evolution of a moral code over generations.
And then you have to consider that Catholic moral theology is just the foundation for Catholic social teaching, which is exactly what is taught to deal with the everyday complex issues where it may not even be a question of "is this a sin?", but rather, "how should I act?".