So is the Old Testament null and void now? Is it completely ignored by Christians?

Why aren't we stoning farmers who grow more than one crop in a field? Or people who are wearing clothes made of two materials? (Leviticus 19:19)
Why don't we execute adulterers? (Leviticus 20:10)
Why aren't raped women marrying their rapists? (Deuteronomy 22:28)
Why do we have women's rights, despite the Bible being clear on its view of women in Genesis 3:16, 1 Corinthians 14:35, and 1 Timothy 2:11-12?
Why are men clean shaven? (Leviticus 19:27)
Why aren't we killing everyone who works on Sunday? Obviously God isn't very important to police officers, mail carriers, doctors, and firemen, so why aren't we putting them to death? (Exodus 35:2)
And why aren't you all becoming eunuchs? Don't you want your special reward? (Isiah 56:4)
Why aren't chronic masturbaters cutting off their hands? Why don't the lustful scoop out their eyes? (Matthew 5:29-30)
Why do we go to court, when the Bible says we should let the church decide disputes? 1 Corinthians 6:1-8
Why do we allow people to divorce? (Mark 10:2-12) And why aren't we killing everyone who remarries? (Luke 16:18)
Why do we call our male parent our father? (Matthew 23:9)
And what do you all suggest we do with foolish people? Proverbs 26:4 clearly states not to answer a fool according to his follies, lest we become a fool ourselves. But the very next verse, Proverbs 26:5, states that we should answer a fool according to his follies, or we will think himself to be wise. What do you think God was trying to say there?
Why aren't we hiding our feces? (Deuteronomy 23:12-14)
Why don't men fulfill their obligation to have a child with their widowed sister-in-laws? (Deuteronomy 25:5-10) Shouldn't we be putting them to death? (Genesis 38:8-10)
Why do we take oaths in courts, when they are clearly from the Devil? (Matthew 5:33-37)
Why didn't we send weapons and money to Germany in 1942? Shouldn't we give Iraq a few missiles or planes before we leave? (Luke 6:35)
Why do some men have long hair? (1 Corinthians 11:14) And why didn't Jesus follow his own advice?
Why do we allow women to wear jewelry and braid their hair? (1 Peter 3:3)
Why do we have hospitals when prayer is clearly all we need? (James 5:14-15)
We do we feed the homeless? (2 Thessalonians 3:10)
Why don't we do everything hypocrites tell us to do? (Matthew 23:3)
Why can't we sell daughters to pay off credit cards? (Exodus 21:7-11)
Why don't we kill rebellious teenagers? (Exodus 21:17, Leviticus 20:9, Deuteronomy 21:18-21)
Why can't we have Mexican and Canadian slaves? (Leviticus 25:44)
Why don't we rape rapists, steal from thieves, and burn arsonists? (Exodus 21:23-25)
Why don't we punish men and boys for being uncircumcised? (Genesis 17:14)
Why do Christians eat pork? (Leviticus 11:7)
Why don't women attending their mandatory ceremonial cleansing after their period, as prescribed in Leviticus 15:28?
Why don't we execute blasphemers? (Leviticus 24:26)