Because humans are pack animals and we need social circles and communities to survive properly in the world.
"The Church" may be a corrupt organization at the top but down at the community level it's almost always a positive thing for its members.
At the end of the day it's a congregation of like-minded individuals who share the same beliefs. Not sure why that needs to be shit on.
That's a good way to look at it.
The Church is different things to different people (religions), generally a body of people. Some people that have no faith look at it as a brick building down the street.
People that have faith say for Christians or Jews is the figurative body of Christ. Jesus being the head, the Jews being are the chosen people according to the Bible and the saved Gentiles (Christians) were grafted on later. God apparently put the Jews on hold for not following the rules, you know, work the land for 6 years and then let it rest a year. That year was designated a year of rest, forgive debts, yada yada.
Jews didn't do it, so in Godly fashion, God said you know what, I'm putting you in time out for 7x70 years, 490 right?. While your being shitheads (disobedient kids) I am going to take another people out of the Gentiles and call them by my name. I'll get back to you at the end and we will settle up. Your still my peeps, but if you do the crime, you have to do the time.
That's the way I understand it at least.