https://www.youtube.com/watch?v=uzcAA2CE0xA
This is a great point to bring up to anyone who claims to be Christian and is a Zionist at the same time. Why should we consider Jews to be "similar" or "the same" as Christian when they reject the most fundamental beliefs and teachings that Christians follow?
Islam is closer to Christianity than Judaism
Roman Catholics who non Roman Catholic zionists call heretics tend to claim Jews, Christians and Muslims worship one and the same God but Roman Catholics are the most correct in their knowledge about that God
I would ask them do Muslims worship the same god as Christians
If they say no I would ask them why they believe that
Once they give one answer I would ask them if they have any additional reasons for why they believe that
Once I get their list of reasons then I would ask if the same reasons they listed apply to Jews
This is similar to what you said but they might not believe the trinity or believe that belief in the trinity is essential
@shortstories Bloodline really is not critical either if you are a follower of Christ. The major point of Christianity was to spread Jesus's message to all people and to bring them to salvation.