It is so common for people to use there testimony which is not wrong to try and convince people of coming to know Jesus. I was listening to a debate recently with Michael Brown. As in the debate the Rabbi said that an Imam said that he used the Quran to get his Muslims of Alchol. So many people use the example that God saved from drugs or drink and growing up in a drug rehab centre and seeing people saved without cold turkey.I think it was Glenn Beck who was a morman said that it was it was his mormanism that helped get him out from his mormanism Colossians 1:13Who hath delivered us from the power of darkness, and hath translated us into the kingdom of his dear Son:The thing is what about people who have always been to church or live in Jewish areas who do not good wrong but according to the bible Romans 3:23 New International Version (NIV)23 for all have sinned and fall short of the glory of God, Isaiah 64:6But we are all as an unclean thing, and all our righteousnesses are as filthy rags; and we all do fade as a leaf; and our iniquities, like the wind, have taken us away.How many people do we have in church who are not yet saved who do not understand the simple gospel. They may be saved from drugs but do they have a hunger after scripture and Gods word? How many people are Transformed but not Regenerated from Death to life. As that what God does through his power !