This poem is saying black people need to stop looking to God/religion to save them from racism. God is not going to save black people from the oppressive society and world they live in. Black people need to stop waiting on God to save them. Instead, black folks have to figure out their own ways to save themselves from this racist world. Therefore, black people have got to stop spending so much time and money in the church.
God works on a different time than humans. If we want change, we need to stop giving ourselves momentary gratification by praying and paying the church (then going back to our old ways). Invest in yourselves, invest in your black communities, invest in your black friends and family, not the church.