Everyone knows that God is omnipotent and omniscient, right?
What do you mean, "Everyone knows..."?
First of all, there are hundreds of religions currently in practice not to mention several more which have fallen out of favor (keep that last bit in mind), not to mention THREE major divisions of Christianity. When it comes to religion you just can't say "God" and expect everyone to know who exactly you mean.
Second, there are three branches of Christianity because not everyone who thinks God had a son named Jesus thinks God thinks the same things (about us) or has the same powers, or works in the same way, or to what ends.
Third, there is exactly nowhere in the Bible where it lists God's powers. There is exactly nowhere in the Bible where is specifically states god is either omnipotent, omniscient, or omnipresent. These are all things people have assumed over the years based on the acts of god in that particular book. In case you're thinking those things might be in another book, there is no other book for Christianity; the Bible is the only sanctioned Christian text. There are other books ABOUT Christianity, and there are other books which contain Biblical characters, and which also add in their own, Paradise Lost comes to mind, Canterbury Tales might be another. It's often these side-projects where many of the ideas people attribute directly to Christianity come from, like the whole thing about Satan and the rebel angels being cast out of heaven, and what those guys are like, and what hell is like... ZERO of that stuff in the actual Bible. Blame the ecumenical councils for that garbage, and postulations on the powers of god, the meaning of life, the nature of Jesus, etc-- extrapolate that all the way down to modern Christians (I assume you're a Christian, because only a Christian would assume everyone else is), with all the inspired fiction writers in between, and you can see why people now might believe a bunch of stuff that's not even part of the religion.
Now that you understand that your question is hinged upon a complete fallacy, you will hopefully realize that is it meaningless.
On to the ANSWER!
No matter which main branch and sub-branch of Christianity you subscribe to, they do all have ONE THING in common, that Jesus is the son of God, born of Mary, and that his mission is to show the people a new way, forgiveness.
In the Old Testament, the idea of sin is fleshed out, but the idea of redemption is nowhere to be seen. God punishes sinners DIRECTLY, and there seems to be no method of cleansing yourself of sin. In fact, Heaven seems to be a place reserved only for those completely free of sin, which you can count on a few fingers, as everyone is born a sinner (thanks Eve!). There is simply not too much mention of forgiveness; wrath, eternal damnation, death... there is plenty of that.
It is not until you get to the New Testament that the concept of cleansing and forgiveness, and heaven for all is introduced to Christianity. In fact, FORGIVENESS IS THE NEW CONCEPT WHICH IS RESPONSIBLE FOR THE RAPID ADOPTION OF CHRISTIANTY! Until the New Testament was written, no religion prior seems to have used this theme-- that ordinary men could be forgiven and live an eternal life in heaven with god.
Here's what you are missing the point of: Jesus didn't die because he got caught up in something he could have avoided, or was somehow unlucky. Jesus went to Jerusalem with the express purpose of getting himself killed! Not only that, he wanted to make damn sure that he pissed off all of the most popular and powerful people he could, so that he was sure to not only die, but die the most horrific and gruesome death possible. Whether god is omniscient or not is irrelevant, it was Jesus' plan all along to get himself crucified. Why?
We are down now to the (lol) crux, of Christianity, that Jesus suffered and died for us!
This is why people devote their lives to him. It's a powerful idea. You are sinner. You are born a sinner. There is no way for you to cleanse yourself of sin (oops, in Catholicism, there is), and you can't live in heaven as a sinner, but you have a friend on your side, someone who will, take the punishment of god on himself, for your sins, so you may live eternally in heaven with god. Most Christians believe that Jesus is an eternal martyr; that he didn't just die that once on the cross, but dies for each and every one of us (who believes the correct things), when it is our time of need.
People devote their lives to Jesus because they think he is literally their savior. The rest of the stuff you have about the nature of Jesus and God is extraneous to the question.
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