And? The stuff people made provides no evidence for God. Only that they revere a being. The systems, power structures and diplomatic missions that people have created point to real, tangible evidence of nations that exist, have motives and can enact meaningful change in the world. God has none of that.
Are tables and chairs any less real simply because people created them?
Sure, but people and organizations act through those. Not gods.
Tables and chairs are nothing more of amalgamations of wood, metal and paint. Nations are nothing more than amalgamations of people acting through institutions. Imo, they're both equally real, because we as intelligent beings have created them and ascribed them meaning and power.