Since old, Christianism has become an umbrella term that encompasses what in my opinion are different religions. Some of which should be called "Joshuaism" instead. Another name for it is Judeo-Christianism.
The alleged Semitic origins of Christianism (as understood in the Catholic and Orthodox Churches) are a deception. During the time of the Reformation, one of the main accusations of Protestants against Rome was that of its Pagan character. And in fact Protestantism reformed Christianism by getting rid of the Western (European) Pagan character and approaching the Middle East, Semitic spirituality.
Before that, any attempt to semiticize Christianism was dealt with by The Western (Catholic) Church, through classifying them as heressies. And so was Protestantism.
It is not incidental that so-called "christian" sects in America are supportive of Judaism and even of Zionism, given that the origins of these wrongly called Christian, Joshuaist sects lie in Protestantism.
But then again, it must be said in all fairness that Protestantism is also an umbrella term that includes a few denominations that are not as radical.
As for Catholicism, it is a problem since it has gone from bad to worse since the Second Vatican Council, especially with ecumenism which opened the gates to Protestantist influence in The Church. The logical consequence of this is being a form of unofficial ecumenism with Judaism.
An interesting comment, by Kalevi:
Definition of Europe
Most outrageous is the fact that it is those coming from a Protestant [and often Puritand and Calvinistic, neo-Judaic] background and tradition, point their accusing fingers to Catholics as "Judeo-Christians", perhaps reflecting their own [Judaic] understanding of Christianism.