Sorry, I honestly don’t know. Wish I could be of more help here.
Happy to share with you on that.
As for the “soul being murdered”, this is my own way of putting it (and I admit it is rather strong) so please know that I am not claiming that anyone else has said it in exactly those words.
Belief in Jesus is can feel like a betrayal of ones very core identity as a Jew, even if one wasn’t religious (as I wasn’t–I didn’t even believe in God.) Honestly, the idea can be repugnant. Like spiritual rape. This is very very hard for me to explain in a message board setting. But it can feel like faith in Jesus would somehow “kill” the Jewish identity, a very central part of a person’s self-concept. Because of this it took a lot of thinking, reading apologetics, and praying, in order for me to convert. (And this is from someone who’d had very positive experiences being around Catholics since the time I was a small child.)
The only analogy I can think of (and it is probably not a good one at that) which might perhaps help you is this–imagine being forced to get a sex change. I am female and being a woman is an inseparable part of my identity–I cannot imagine being anything else, and I don’t want to be anything else. (And I don’t in any way mean that to sound like male-bashing, it’s not, I promise!) To became a male, it seems, goes against my very nature, the core of my being–because I am not just a human, I am also a female, and my gender identification is a very deep part of my psychological makeup. If I were to be made into a male I think I would feel lost and not know who I was.
So, going back to the rabbi for a moment. The idea of a Trinitarian God just goes against what a faithful Jew believes (in earnest) to be the Truth about God’s nature. It’s unsettling. And it can be hard from a Jewish perspective to see this other religion (Christianity), claiming your own sacred scripture as its own spiritual heritage, and then (from the Jewish perspective) reading things into that scripture (such as the Trinity) that is a Jew earnestly believes is just not there.
I am so sorry, I feel like I am doing a poor job explaining this. Let me know if you have more questions and I will try to help. Just know, though, that aside from religious training as a youngster, I was not an observant Jew so I am somewhat limited in my ability to answer questions. (But I do know of resources filled with people who can–other Jews who are now Catholic or Christian).