The worst experience I had was getting an E-mail from an anti-missionary who was raised in my Jewish neighborhood and went to the same schul that I went to growing up.
He was much younger than me and I did not know him.
I was in Latvia when I received the first E-mail from him presenting himself as interested in finding out about Yeshua.
In one of his E-mails he wrote "Believe it or not, I am learning a lot by the questions you are making me ask and the research I am doing. I will continue my studies in Matthew and will share with you what I find."
After a few E-mails back and forth, I decided to "Google" his E-mail address and found out that he was an anti-missionary. I wrote him and told him that he should start at least keeping the Ten Commandments and stop lying. He wrote back and with chutzpah said, "I am so glad to hear from you. I was afraid that you had totally written me off. I am also glad that you heard about Torah Atlanta (his anti-missionary organization)."
He continued his E-mails and in a classic one he said, " I am just imaging your journey from that place to where you are now. Obviously, you must have felt a lot of emptiness there, and probably some hurt. No matter how you have tried to describe it to me, it still sounds that you have cut yourself from the Jewish people. And that must hurt too. So I must believe that the relief you have found outweighs the pain of your Jewish upbringing, plus the pain of your leaving our heritage." Obviously, this anti-missionary was using something called auto-suggestion...trying to put thoughts into my head...planting bad seed. This is a process also used in witchcraft. A quote from an online encyclopedia says, "Auto-suggestion may produce hallucinations and delusions in otherwise sane subjects; and for those who do not question the reality of witchcraft this must operate powerfully."
When I received this in Latvia, we had great favor with the Jewish community. The Rabbi wasn't very thrilled with us, but we had great favor with the Jewish hospital, Jewish library, Jewish shop, etc. Even the Israeli embassy stuck up for us when the Rabbi tried to stop us from renting a public place. In fact the Jewish community in the city with the second largest Jewish population in Latvia had matzah one year because the leader of that community knocked on our apartment door one day telling us that if we didn't get matzah to his Orthodox Jewish group in our VW bus that they wouldn't have matzah that year.
The anti-missionary's comment about me "leaving my Jewish heritage" was just as mishugana as his other comment. Our lifestyle has remained Jewish. We have not taken on a Gentile lifestyle. May G-d draw him to Yeshua and may Yeshua reveal himself to him with supernatural signs!
I picked up a valuable, logical, thought from Mitch Glaser.."A sincere seeker will be able to honestly pray, "God of Israel, show me the truth and if Jesus is the Messiah I am willing to believe in him." Test your seeker.