Bonsai,
"Being a witness helped me to overcome the beginnings of substance abuse."
Being a witness has led many to substance abuse. Probably more than those it has helped.
"I met many good people who taught me a lot of good principles in life."
Many Nazis, aside from their heinous crimes, were moral and ethical in most regards. The Witnesses believe in genocide. No, Godwin's Law does not apply.
"This religion helped me to make many contacts so I could travel to many countries with ease. It taught me how to be a good, persuasive public speaker. etc. etc. I lived. I learned."
You could have acquired those skills and contacts without the negative effect of the Witnesses. I will admit, though, that the Ministry School does hone your public speaking skills and draws some introverts out.