Why Do People Give Money (aka Government Federal Reserve Notes) To “Church”?

There is No Separation of Church and Government

Money is from the Federal Reserve. Why is Church and Government mixing? Shouldn’t God have money? Why does God use “earthly” money? Since church is spiritual, why does church run off of government created money and not Godly created money? I thought God was over all things. Why does the Federal Reserve create money for people to give to churches? Let’s face it, there is no separation of church and government.