Why does my cat cry all day long for food & love?

And I mean allllllllllllll day long. If I am not cuddling or feeding him he cries this most annoying cry. I have had cats all my life & never had such a nuisance of a cat like this one. He jumps all over my table & my counters & I have never not been able to train my cats NOT to do this until now. I currently have 2 cats & one kitten. Ernie is my middle child. I feed him more than any other cat and cuddle him more than any other cat but it is never enough. When I am on the phone people think I have a child screaming in the background (no joke)- Sometimes I seriously think about getting rid of him but I just don't have the heart as he is such a love. He is my only cat that can eat 24-7 - I can't even think about taking out people food w/o sharing with him because he is soooooooo annoying!! I can not leave anything on my counter tops because he will eat thru bags to get to any food that's there. My sister left bread in a package and he ate almost the whole loaf not once but twice. His favorite is organic popcorn (only the best) - I now put all my food no matter what it is in my cabinets. I know that he is not sick I take them to the vet regularly & they are up to date on all their shots-he has been like this all his life he is now 5 1/2 yrs old. I got him from my vet. He was a wild cat but a love such a love. Kisses my nose like a dog- actually I call him my dog because that is what he acts like. He is neutered, de clawed, and fights constantly with my other cats. He used to get along with my oldest (Snuggles) until I got my baby and now they all hiss all day long. My baby is a year old still loves to play. And the others hate that she is so active. Ernie & her fight terribly. All you hear are cat fights all day long. However now I am at my wits end....I woke up the other day & saw that Ernie opened my kitchen cabinets & ate all my homemade oatmeal cookies. There were crumbs all over the counter & my floor - I thought I was going to commit cat abuse but instead I am spilling my guts hoping that someone out there has an answer to this outrageous behavior.