Meaning of Quran 2:111 “Produce your proof”?

Question

111. And they say: "None Shall enter Paradise unless He be a Jew or a Christian." Those are their (vain) desires. Say: "Produce your proof If ye are truthful."

112. Nay,—whoever submits His whole self to God And is a doer of good, He will get his reward With his Lord; On such shall be no fear, Nor shall they grieve.

Please answer what is this proof? Where is this proof to come from?

Answer 1

There isn't any. The whole point of these ayat are as a challenge to the people making these baseless claims without any proof to back them up.