How about this. I am a Christian and I am personally anti-zionist.
However, I am not anti-semetic like I suspect you are.
So, here's my proposal. I willingly take upon myself the mantle of a Jew for the purposes of our relationship.
Henceforth, I want you to consider me and treat me as you would any Jewish person, ok? Consider me to be what I think you believe is the "worst" kind - Ashkenaz.
Now, let's proceed accordingly.