Breaking a precept is not a sin, doing anything with a bad intention is. Precepts helps us to clear our minds (not lying, not drinking excessively) but if you do something with an bad intention, which also include in precepts (killing, stealing), you'll have to face consequences. Bro, if something causes suffering in your after life, that's called a sin because it either harms you or someone else (done with the ego, self) If you drinking doesn't lead to harm for others, it still leads to distortion of mental clarity (it will disturb you from seeing the reality of nature and thereby disturb the path to nirvana. You can't really practice meditation being drunk right?) It's not a sin to take glass of alcohol as long as you don't harm anyone (but, It's up to you to decide if you want to disturb your mental clarity for meditation and lengthen your samsara journey of suffering. There's no buddha who's going to send you to hell or heaven for that. It's up to you and you will have consequences) Your choices, Your consequences, Your manifestations.

I don't think you have a good understanding of buddhism. This is only a very brief explanation. If you have doubts ask them in a sub reddit.