History is I think the main reason for the opposition towards Jesus. Especially the expulsion from Spain is certainly foremost in the minds of most Sephardim. Yet learning the actual history of the bitter struggle to rid Spain of Muslim overlords gave me an idea of why Isabella and Ferdinand thought it would be best not to have  a "fifth column" of people that were either active  in helping the Muslims, or at least were certainly on the Muslim side in terms of ideology --thinking (as they still do) the Muslims were not idolaters as they think Christians are.

 

Columbus received his commission to  just as Isabella and Ferdinand were entering Granada, the last stronghold of Muslim rule in Spain. And that is exactly when the decree was issued. I.e. in simple terms the king and queen were not making any distinctions at that time. All enemies had to go.

And as for the idea of Christians being idolatrous has seemed to me less than accurate after learning some of the  books of Avraham Abulafia [a mystic of the middle ages.] [Only printed recently. Mainly he is brought in the Remak [Rav Moshe of Cordova] and Rav Chaim Vital. I saw his books only in microfilm. Later they were printed.]  

So then why would it not be idolatry? You would have to resort to the idea of souls of Emanation [a frequent concept in the Ari/Rav Isaac Luria]. And Emanation is pure Godliness.