The gospel is not 'be a good person' or 'follow Jesus' example.' It is specific historical good news: God became human in Jesus Christ, lived the perfect life we haven't lived, died in our place for our sin, rose from the dead, and now offers forgiveness and new life to everyone who trusts him. This is announcement, not advice. It is something that happened, not something we do.
The single most important distinction in Christian SRE is between teaching the gospel (the announcement of what God has done in Christ) and teaching moralism (advice about how to be a better person). Both involve the Bible; only one is Christianity.