Here are a couple of ministries you could use.
JWbooks@sbcglobal.net Former JW Duane Mignani--Has Ministry to JW---Email address
www.saintsalive.com Former Mormon Ed Decker has ministry to Mormons --- Website
Andrew G (21 Apr 2011)
"Articles written by former Mormons"
Dear John and Doves,
Please give me some web sites/articles written by former mormons or
Jehovah's witnesses. Emphasis: salvation and trusting Jesus Christ.
They could be useful witnessing tools.
Thank you very much.
May God bless you and your ministry always
Andrew H, G