I only started skimming through the first reply to be honest and felt compelled to respond straight away. Maybe I replay again after having read the replies properly.
First, I want to offer a different perspective than Bonita. (Sorry Bonita, I usually agree with you!)
I don't feel that this pup is a "brat", nor do I think he is "challenging you over a collar and lead".
Because:
JustCarol28
When he sees the collar in our hands, he will run away to his carrier case.
JustCarol28
This morning we attempted to introduce the collar to him and he irinated on the floor.
Both symptoms that point to FEAR. The neck and throat is a vulnerable area. Add the lead and the
situation worsens - now not only is he frightened but he can't get
away! Have you tried using a harness instead? This should feel less threatening to him (not on his neck) and may be more comfortable for him. Many small-dog owners use harnesses instead of collars to avoid harmful pressure on the trachea. This could be a short term solution, while you work on etting him used to wearing a colalr so he can wear one full time, with an ID tag attached (This is where I am in 100% agreement with Bonita!)
Now, IMO, keeping in mind that this pup is frightened and confused will help you to handle the situation apprpriately. Words like "brat" and "challenge" put you in a different frame of mind - and IMO the wrong one! I really do think you are on the right track with training treats when he goes near the collar.
I also agree with Bonita is that this is due to a lack of training and socialisation when he was young. If you want a dog to accept other people and dogs, he needs to have many varied, positive experiences with them while he is young (under 4 months). It is really no different with the collar and lead, or handling of all parts of the body. What he is really frightened of is the unknown.
This is a video of a simple technique you could use to help Jesus. It is very gentle. It shows a dog who went into a frenzy any time his owners tried to trim his nails, but the basic idea is pretty much the same. It involves using a marker to shape a positive behaviour and response from the dog to replace the undesired behaviour and help him overcome his fear (because he will begin to associate the collar with ood Stuff) If you do just a little reading to understand the basic principles it won't take long to see a significant improvement. The marker used in teh video is a clicker, but you don't have to use one. You can pick a distinct sounding word and train yourself to say it the same way each time instead. The clicker has a hge advantage in taht it ALWAYS sounds EXACTLY the same and it is very, very precise. This can't be over emphasised enough 
If Jesus were my dog, I would use a harness for the times I needed to attach a lead, just for the next few days. During that time I would handfeed all his meals. Meal time would consist of me bringing the collar out and placing it in clear view of Jesus, then start feeding his meal. When the meal is over, I would put the collar out of sight. I would do the same at snack time, any time the dog has treats. If he loves belly rubs, you could get the collar out and leave it in view while you give him a belly rub, then put it away again. You could use a bum bag (fanny pack?) to put the collar in so you can easily take it out each time something FANTASTIC is about to happen for Jesus - and then hide it away out of sight immediately afterwards. At the moment, he sees the collar and he feels scared, confused, tense, on guard.... this makes him difficilt to work with. This exercise will help him to change his mind about the collar. Instead of dread, when he sees the colalr he should think "Yippee!!!" If you know what makes this little dog tick - what he would kill or die for! - then this process shouldn't take long. If you don't know, you need to find out! The information will be INVALUABLE to you ANY time you need to teach him something.
When he started to view the colalr a little differently, I would start behaviour modifictaion. Personally, I would use a clicker for this one. I'd ahve several short sessions of "charging" the clicker. (Click, treat, click, treat, click treat... until the dog KNOWS that the two are paird and the treat will ALWAYS follow the click). Then I would start to "shape" his behaviour, just as you have been doing - that is allow him to do it on his own and "capture it". So I'd take the collar out and leave it in view. Jesus should do SOMETHING at this point. Anything. He is likely to glance at it. Click immediately (followed by treat). He is not likely to be tense at this point - he may have decided that his humans have given up trying to put the horrid thing round his neck, and only good things happen when the colalr appears. So at first you may just be doling out treats simply because he is behaving CALMLY and HAPPILY in teh presence of the collar. That is not nothing, that is SOMETHING. It deserves a reward!
If he glances at the collar or does ANYTHING colalr related - no matter how small - click and jackpot! Lots and lots of little tiny treats, a small handful, for just one click. Have a PARTY. Let him know how wonderful he is. Continue to click and treat for any collar related behaviour he offers.
Treats should be TASTY and TINY!!! I mean about half the size of your smallest fingernail. Initially you should be doling out LOTS of them. Lots and lots. FIND things collar-related to give Jesus treats for, no matter how small and ridiculous they may seem to you. It should be easy and fun for Jesus.
You could also (for example) bring the collar in the room and place it at the other end of the room to Jesus. Does he know a sit stay? You could give him treats for remaining in the sit stay, with the collar at the far side of the room. Then go and move the collar and pace or so closer and repeat. Keep the first session short and end it positively before he becomes tense and scared.
Once he is happy about going up to the colalr and pawing at it or picking it up and having YOU hold it near him (this might take several sort sessions, keep your expectations low) - then touch it lightly to his body for a milisecond, click and jackpot. You might want to end that session there and revisit later. Push too far to fast and you'll be back to square one.
Now, I am imagine being a tiny little dog and I am thinking that having a collar FASTENED around my neck - the actual act of buckling it - is going to be very threatening. So I would have the collar fastened on its largest setting, large enough that it could be EASILY looped over his head as long as he remained fairly still. What I would want to do is "shape" the behaviour of the dog actually putting his nose through it, or at least remaining still and cheerfully calm while I moved the collar towards his head.
So then you have reached the point where the dog is wearing the collar. It's too big at this stage and he could not wear it for long, nor without supervision. Now I'm GUESSING as I haven't seen Jesus but honestly, I'd be expecting him to be OK with the collar (wearing it on its largest setting) within a few days and wearing it (normal size, full time) within about a week. But then I am the Eternal Optimist. Guessing again, I'd expect him to take a little longer to be totally happy and confident about having it actually FASTENED arond his neck. I could be hugely wrong - some dogs learn slower than others, some are more stubborn and some are more lacking in confidence.... but then again he could be wearing the thing 24/7 in 2 days. *shrugs* I think you are on the right track, I think you just need a way to tell him exactly WHY he is getting these treats, a way to communicate to him that they are connected to the collar. Once he gets the light bulb moment, he'll make Progress 