If God is everywhere the why do people go to church ?

they don't. God said the people are the church, not some bricks and mortar building which has riches inside that God is ashamed of. 

 Childhood  peer brainwashing normally in most cases

To fellowship with other believers without getting wet. 🤣 It's for the same reason confused Atheists meet up in their indoor sex orgy clubs, drug binge hot spots and indoor satanic temples/meetup spots.  Who wants to get wet, bitten by bugs and mosquitos, freeze or get sunburn all the time👍.  Not even you Satanists want to do that.  Most modern humans meetup indoors for almost everything except during covid-19. Catch up ok? 😷😂😙.  Meeting indoors is more efficient than battling with the elements. Most of us humans and animals figure that out millennia ago. Even the caveman knew that but you so called superior intelligenced Atheists aren't so sharp. Newsflash! Humans like to control their environment. I guess that's a new one on you. 

When the Israelites were Gods chosen people, they would go a certain mountain or the temple they constructed to worship God. In Jesus day, people would go to Jerusalem to worship God. There is nothing wrong with worshiping in a place where you can encourage and show love to one another. Read Jesus words at Matthew 18:20. Also, Hebrews 10:24-25. It is encouraged!

This is away for man to gather together as one. To commune together in Christ under God. It brings men together to help them find spiritual righteousness. But today churches can decived many so be careful. The churches that does not focus on Jesus is not a church under God. Also a church who focuses only on works will fall short of God's Grace.  

The church is not a building but the faithful in Jesus, the Bride of Christ who focuses on The Word of God. Who reads and studies the path to God the Father in Heaven. 

They think that they are doing something necessary but, they have been taught to go to church for one reason and that is to drop money into the basket.

to make the preachers wealthy and so certain preachers can molest kids

Because Christians are a family, brothers and sisters in the Lord. A family comes together to support one another and share with one another. This is true of all Christian churches. In the original and true Christian Church, we also go to Church because Jesus Christ is physically present there, and we receive Him into our own bodies, hearts and souls.

If everybody has birthdays why do people have parties?  It's better that way.

You show a photo of a Catholic service of worship. But their reasons are almost the same as for Protestant ones. They are public, as an open testimony to the world that we worship our God openly, regularly, and anyone can sit in, if they wish. We are not doing things in a corner. There is both fellowship with believers and with God, as Jesus said, "Where two or three are gathered in my name, there I am in the midst." We can partake of sacraments, such as the one Jesus commanded, the bread and wine in remembrance of His death for us. We can hold baptisms and rejoice together. (You can't baptize yourself or have the sacraments on your own.)

Our gathering together for worship in no way counteracts the fact of where God is present, but if you are an atheist, you cannot even logically ask, "If God is everywhere...".