All you need. Nothing you don't.
“Simple church” may lead some to the premise that simple is necessarily going to be easy. I think not, though I am not uncomfortable with the phrase: simple church.
Things indeed have gotten a little too complicated with respect to most institutions – government, family, school – just about every aspect of life.
Losing weight, for example, is simple but not easy. Love is simple but not easy. Etc. Most every solution to every problem can be reduced to something… simple.
Praise the name of our Lord and for the simplicity of Jesus Christ! Yet his love is such a mystery that even angels desire to peer into its depths.
It was revealed to them that they were not serving themselves but you, when they spoke of the things that have now been told you by those who have preached the gospel to you by the Holy Spirit sent from heaven. Even angels long to look into these things. 1 Peter 1:12 niv