Certainly it is true that not a sparrow falls without God knowing of it. This observation goes to divine omniscience.
But from there it cannot follow that God is sitting up there in Heaven, with His trusty divine pea-shooter, blowing sparrows out of the sky. This goes to divine omnipotence.
God need not "overdetermine" the universe because His original Creation was faultless — His Word of the Beginning, Logos Alpha to Omega; eventually the Son of God Incarnate, whose inexhaustible suffering and kenosis was performed as a Man on the world stage, out of the perfect Love of the Son for His Father, so that we sinful, "fallen away" humans may be restored — after the sin of Adam — to the good Grace of our divine Father, and achieve our divinely-ordained status as images of Christ, by the Light of Christ, according with His holy Grace, not to mention Love....
Hope you get your computer problem resolved really soon, dear brother in Christ. It can be such a "bummer" when these critturs go down — one can become accustomed to and very dependent on them in so many ways. I speak from experience here!
It is good that you pick Jesus' sparrow passage. The Matthew version follows:
28 Do not be afraid of those who kill the body but cannot kill the soul. Rather, be afraid of the One who can destroy both soul and body in hell. 29 Are not two sparrows sold for a penny? Yet not one of them will fall to the ground outside your Father’s care.[b] 30 And even the very hairs of your head are all numbered. 31 So don’t be afraid; you are worth more than many sparrows.
Notice that the passage you mention, sparrows, is joined with the other side of the equation "hairs of your head".
It does not in this passage mention the number being known, although that number is known. Notice, instead, that they are NUMBERED, that is, they are limited by the number God has ordained.
This is the case in the Bible in many lives in which are told of God determining the beginning, the middle, and the end of days for any number of people. If God "over-determines" any life, then God can determine all lives.
Computer is up; I hope to address your and Alamo-Girl's thoughts on sin, Romney, Israel, and Obama at some point today.
I'm also hoping to hear that ObamaCare has been struck down by Scotus.