[SillyEvee]

Drinking is definitely NOT a sin in the OT. In fact, it's encouraged. It's a must to have a glass of wine (or a sip, for kids) every Friday night. In fact, on Purim, we are encouraged to get drunk so we can hang out with G-d without the intrusion of our intellect. This simulates the feelings the Jews had when they learned that King Achaverosh of Persia wasn't going to kill them. We're cautioned not to get high on any kinds of substances in the ordinary course of things, since these are "artificial." The only "real" high comes from knowing G-d. In some cases, alcohol can get us closer to G-d, but only if it's being used conciously for that purpose.

Anyway, I don't think we're supposed to be perfect. Only G-d and angels are perfect. G-d's only perfect because G-d is everything and angels are only perfect because they have no free will. G-d created us with the ability to turn away from Him, and He fully expects us to.
But even better, He created us with the ability to turn back to Him. That's all you need to get into Heaven. Just turn back. G-d does not delight in the death of the wicked. Rather, He awaits that they turn from their wicked ways and have life. (That's paraphrasing a passage from one of the Prophets, but I can't remember which one.)