The Truth is not a property of anywone. Simply - if Christians are right then Muslims and Atheists are wrong. If Atheists are right then both Christians and Muslims are wrong.
And we all think that we are right. The difference is that Jews do not say that everyone has to convert to Judaism in order to be "saved". I have no problem with a non-Jew believing in Jesus as God. I'm more interested in their behavior than in their beliefs. I do, however, prefer that Christians understand that their conception of God is neither proven nor universally accepted.