It does not exist.
Every Church has flaws, problem people, leadership issues, worship struggles, and lacks ministries. Every. Single. One.
The only way to improve the local Church is for God to work through you. It is not someone else’s job to fix things to please you. Your responsibility is to dig in and start working beside the people for a better outcome.
Christianity is not better if you find the right Church. It is better when you commit to making the best Church possible while allowing God to work through you.