Ok starting up a new charector and playing by some rules. Ill go ahead and go into his spec.

Hes a dunmer, assassin/theif
His skills are conjuration, illusion, light armor, archery, speech, security, sneak, short weapons, block, and the one for running lol I forgot its name.
Except the skill that I level up for jumping and for barter that happens automatically for selling stuff, I will only be using what my skills are and what I find.
That means the only weapons ill be using is what in short blades, archery, and conjuration.
Only be wearinh lighy armor and light armor Shields.
For healing I will only be using what pots and scrolls I find or buy.

Thats it. I wont be using any healing spells or spells outside of conj/illusion.

Putting all my points into agi/int/speed first, then willpower and strength to 50 and dumping everything else into luck. Planning on keeping endurance at 40 throughout the game if I can help it.
also I will not be using wait, and will only sleep when a bed is nearby.

So seeing my rules and makeup, will thos charector be able to finish the main quest and the 2 expansions?

Also u think it be challenging or ill still become a demigod even though im only using the skills I selected at beginning and none else?

Yes, of course.
Any type of build is completely playable and can finish the game.
It's impossible to make a "bad" build.... some are just much more difficult than others. (due to skill choices or poor balancing)

Your build looks fine. You should not have any extra difficulties caused by your skill choices or rules.

ok was wondering bc I heard that the glove u had to have so much health and was wondering bout the werewolves.

But kickass, wish me luck lol.

Glove? I'll assume you mean Wraithguard.
But I think you're getting your facts confused. Don't worry, the game prepares you for what you need to do.

The werewolves will kill you, yes. But they kill everyone. Hardest part of the game probably.
By the time you get to the end of Bloodmoon you should be around level 25-30, so you should be able to think of ways to deal with them.

looks like a pretty standard style of build. i've done characters of similar make up before and have lasted just fine. you will find with a low endurance for the whole game that your total health will increase much slower, but potions are very easy to stock up on from merchants and finding as loot.

i don't think you'll become a demi-god with the play style since you probably won't get the +5 attribute bonus at every level. and you may struggle with your illusion skills without personality increases (you didn't mention a plan to put points to pers which with speechcraft and illusion you may want to consider)

in regards to the "glove" that requires high health. that's only if you use the backdoor method to complete the main quest. if you intend to do the MQ through the front door there is no penalty for putting on wraithguard

tribunal and bloodmoon have enemies that hit particularly hard so you may find the need to strategize if you have low overall health, but they're no cakewalk with high health either.

Sweet. Of course with the rules yal can tell im rping lol. Just wanted to make sure that build was doable but still somewhat challenging instead of faceroll keyboard demigod