Surely, all football fans have seen that sign in the stands saying John 3:16. Please don't stop with that verse. God's intention is that this eternal life is for us all.
Jesus said that those who believe in him may have eternal life; also see, John 3:36; 4:14; 5:24; 6:27: and 17:14 (with thanks to The New Interpreter's Study Bible).
What is being promised? Not just heaven later after we're dead. The word we translate as eternal carries the meaning of a different quality of life, a new life free of the worldly, temporal concerns of the old life.