Testimonies are great things about what the Lord has done for us, but no-one will be offended when you talk about what God has done for you. You need to be specific about sin, about Christ's death on the cross, about others' need for a saviour, and about their need to repent and trust in Christ.
Mark DeverFriend, the church finds its life as it listens to the Word of God. It finds its purpose as it lives out and displays the Word of God. The church’s job is to listen and then to echo.
Mark DeverUnfortunately, many of our churches calibrate their life to these nominal Christians. The predictable result is that you get fake, hypocritical churches that confuse the message of the gospel and make it hard for others who are trying to do genuine evangelism.
Mark Dever