These three religions, in the vast majority of their official doctrines, are mutually contradictory. For example, Christians of all denominations believe that belief in Jesus as savior is required for salvation. Judaism and Islam reject this. Muslims believe that the path to Heaven is through the Koran, which Judaism and Christianity reject.
It is possible that all three are false. However, it is impossible that more than one is true.
Therefore, for the sake of advancing humankind toward truth, let it be resolved that
A. One of the three should be declared “most likely to be true”.
B. The outcome of this debate will be decided based on evidence and argument, not on emotion or faith.
The first step in this debate is to determine the broad outlines of where the three agree and disagree. Then we will be able to focus on those points of disagreement, present evidence for each side, etc.
One need not be an adherent to any of the groups in order to argue in favor of its position. On the contrary, a spirited argument in defense of your opponent is often the best way to arrive at the truth.
However, if your mind is closed, this thread is not for you. I would challenge all participants to have the attitude of, “If X religion were proved true, then I would become an X.” Because if you have emotionally steeled yourself against the possibility of X being true, you won’t be able to examine the evidence objectively.
In other words, keep it friendly, folks!