What we know about Jesus, is secondary source. He did not left any written material and most of the gospels were written 20-30 years after his death. I personally like the human site of Jesus that JW do not bother to teach. For me the wake up call was the story of the Jesus and Samaritan woman at the well. Woman, who had multiple husbands in her past and lived in concubinate relationship (there are articles that disputes it) as said in John 4:18. Last year I had visitited my JW relatives and I had read this story in the magazine that I bought with me to read on the bus. We eventually came to this article and I was very suprised that my JW relatives had no recollection of this story. For JW that I grew up with Jesus is like conqueror who like Gengis Khan will take over the world and I was constantly remained in my childhood that earth will be covered with so many bodies that birds will eat them. This is the vision my JW family had.
I will say the biggest disservice toward Christianity came from the founder itself, the Apostle Paul. He was antisemitic, homophobic, intollerant, and misogynic bigot, who eventually had to seek a protection from his fellow Jews in Rome at Nero itself...