I often hear this thing you re saying. And i always give this answer.This world we live on now is like a test for you and me, this world is ran but santan. Heaven is peacefully, makes a lot of sense when you think about it, there will never be true peace on the earth wild we are still being tested.
Give me the proof that heaven exist, that this world is nothing but a test. The life right now is real. The pain you feel is real. The love from your friends and family is real. No one likes to feel the pain. Everyone love peace. Without a cause there is no hate in this world. So don't say that we are in a test. When we die, everything is over. We are just a form of life. There is no heaven no hell and yeah no god.
True peace yeah will never come on the earth. However instead of believing and leaving it to god, we should try to do something. Don't get me wrong, but if you look in a way, one of the main cause for war and hatred in this world is also because of God.
Everyone should just try to be practical. U_U