Actually, that is closer to the truth than most people realize. Jews get upset because Jesus is linked to all the horrible things Christians have done to Jews over the last two thousand years. Christians get upset because we still follow The Law when they claim Jesus destroyed it (even though He actually said He did not).
It is a strange world in which we live when Christians are unhappy that I am doing what Matthew, Mark, Luke, John, Peter, Paul, and Timothy all did...oh, and Jesus Himself did.
I have no stances in respect of the religion s legitimacy as
religion is a purely private affair but it happens that those
in control of religions did grant themselves the right to decide
who/what is "halal" (muslim term to name what is within the law)
and who/what is "haram" (what is against the law) , wich is somewhat
the application in religious matter of the law of the powerfull.
As such , an isolated individual is negated the right to be part
of a religion if he doesnt embrace the whole of the said religion tenets.
Embracing judaism and christianism will forcibly put the follower
of such a dual pratice at odd with both of the religious currents;
moreover given the historical grievances between the two cosmogony
despite their common origin.