The concept of sin, as it exists in western religions (i.e. a deliberate act of disobedience against god) does not exist in Buddhism.
No, it exists as a deliberate act of disobedience against heaven, or the Dharma. Same thing in principle.
In Pure Land (Eternal Bliss) Buddhism, the correspondences are very close indeed.
The
Pratyutpannabuddha Saṃmukhāvasthita Samādhi Sūtra does not enumerate any vows of Amitābha or the qualities of Sukhāvatī, but rather briefly describes
the repetition of the name of Amitābha as a means to enter his realm through meditation:
"Bodhisattvas hear about the Buddha Amitābha and call him to mind again and again in this land. Because of this calling to mind, they see the Buddha Amitābha. Having seen him they ask him what dharmas it takes to be born in the realm of the Buddha Amitābha. Then the Buddha Amitābha says to these bodhisattvas: "If you wish to come and be born in my realm, you must always call me to mind again and again, you must always keep this thought in mind without letting up, and thus you will succeed in coming to be born in my realm."
wiki emphasis mine
St Paul says exactly the same thing: Pray constantly. In the Christian Tradition there is the
Prayer of Simplicity and, to paraphrase the underscored above 'the repetition of the name of Jesus as a means to enter His realm through meditation'.
I suppose most Christians would answer the question about heaven and hell in the same way as Augustine answered the question about time: 'when you'd don't ask, I know what it is; when you ask, I don't know'.
I don't believe in an eternity playing the harp on a cloud, or being tickled by demons in some fiery pit. I tend to see it as being and non-being.
But most people need a sensory focus for abstract concepts to become 'real'; the number who are satisfied with a pure idea, without form or description, are very rare.
The big issue is divine judgement. Buddhists have karma.
I have trouble with it as something purely mechanistic, and in that sense it stands in contrast the the Buddhist idea of compassion, and I can't see how a mechanism can be so unrepresentative of the highest expression of human nature – love, compassion, empathy, call it what you will – or conversely how compassion can redress 'karmic debt' when karma is blind to compassion?
As you can see, my understanding is threadbare, and I've never really pushed it. But I do assume I've got it wrong, I do not believe that Buddhist philosophy or metaphysics is defective as my expression of karma would seem to imply.
Buddhist cosmology contains not heaven and hell, but
many heavens, and
many hells, with some kind of judgement device which determines who goes where ... and spirits and demons in abundance!
So basically what I'm saying is that outwardly, the Christian notion of heaven, hell and divine judgement has a unique expression, but if you take it back to principles, there's the same idea expressed in all traditions, just according to their own doctrine ... but many of the common expressions are as way off, and as sentimental, as any other.
no heaven and hell, no elaborate system of reward and punishment in the afterlife.
Yes there are ... there are plenty.
Buddhists have the law of 'dharma' which is essentially the law of cause and effect.
OK. But then I would say my spiritual aspirations transcend a purely mechanical state of being?
So negative actions have negative consequences. This is not the same as the western idea of 'sin'.
You miss the point. Why does one act in a negative manner when one knows better? It's not the act that is the sin, it's the reason behind the act. The same act can be a virtue or a vice, depending on the reason the act was performed.
If karma can't see
that, than it's a very superficial doctrine, and we're all bandjaxed!
Example: Aquinas offers the analogy of a rich man giving alms to the poor. If he does it to share his wealth with those in need, it's a virtuous act. If he does it to make himself wealthier (in esteem) in the eyes of his fellows, and actually he doesn't give a fig for the suffering of others, its not virtuous at all.
If all karma sees is the giving alms, then there's a whole dimension of morality and ethics that it's completely deficient in, as a measure of cause and effects towards, presumably, some ideal state.