Bret Corbridge has asked a lengthy list of people, including myself, to write a testimony as inspired for a collection he felt prompted to publish.
It is available on Amazon for print cost, and you can get a PDF download for free if you ask anyone who has it.
I have not yet read the entire copy, but I know my brief entry contains what I received when I prayed and asked God if I should participate and what I should write.
Having read the book, I would not advocate reading it. By saying that, I mean no offense to any who participated in the work.
If you want to help LDS convert to Christ, tell them to read the scriptures. If they still don't get it, tell them to read "Teaching for Doctrines the Commandments of Men."