You're taking the verse in Isaiah out of context and corrupting its meaning. Look at the whole passage.

(Isaiah 1:2-20 NIV) Hear, O heavens! Listen, O earth! For the LORD has spoken: "I reared children and brought them up, but they have rebelled against me. {3} The ox knows his master, the donkey his owner's manger, but Israel does not know, my people do not understand." {4} Ah, sinful nation, a people loaded with guilt, a brood of evildoers, children given to corruption! They have forsaken the LORD; they have spurned the Holy One of Israel and turned their backs on him. {5} Why should you be beaten anymore? Why do you persist in rebellion? Your whole head is injured, your whole heart afflicted. {6} From the sole of your foot to the top of your head there is no soundness-- only wounds and welts and open sores, not cleansed or bandaged or soothed with oil. {7} Your country is desolate, your cities burned with fire; your fields are being stripped by foreigners right before you, laid waste as when overthrown by strangers. {8} The Daughter of Zion is left like a shelter in a vineyard, like a hut in a field of melons, like a city under siege. {9} Unless the LORD Almighty had left us some survivors, we would have become like Sodom, we would have been like Gomorrah. {10} Hear the word of the LORD, you rulers of Sodom; listen to the law of our God, you people of Gomorrah! {11} "The multitude of your sacrifices-- what are they to me?" says the LORD. "I have more than enough of burnt offerings, of rams and the fat of fattened animals; I have no pleasure in the blood of bulls and lambs and goats. {12} When you come to appear before me, who has asked this of you, this trampling of my courts? {13} Stop bringing meaningless offerings! Your incense is detestable to me. New Moons, Sabbaths and convocations-- I cannot bear your evil assemblies. {14} Your New Moon festivals and your appointed feasts my soul hates. They have become a burden to me; I am weary of bearing them. {15} When you spread out your hands in prayer, I will hide my eyes from you; even if you offer many prayers, I will not listen. Your hands are full of blood; {16} wash and make yourselves clean. Take your evil deeds out of my sight! Stop doing wrong, {17} learn to do right! Seek justice, encourage the oppressed. Defend the cause of the fatherless, plead the case of the widow. {18} "Come now, let us reason together," says the LORD. "Though your sins are like scarlet, they shall be as white as snow; though they are red as crimson, they shall be like wool. {19} If you are willing and obedient, you will eat the best from the land; {20} but if you resist and rebel, you will be devoured by the sword." For the mouth of the LORD has spoken.