I am a Moroccan Muslim living in Greece. These days here they celebrate the crucification of Jesus. I have heard that they bring a holy light from the grave of Maryam and really everyone here believe this. They bring a holy light from al Kudos from the grave of Maryam. My questions is if really it exist such a thing because they pretend its a miracle. If possible I want an answer on my e-mail.

Praise be to Allah, the Lord of the Worlds; and may His blessings and peace be upon our Prophet Muhammad and upon all his Family and Companions.

Before answering your question, know that Prophet Issa Ibn Maryam (Alaihi Salaam) was neither crucified nor killed.  The one who was killed was a man who looked like him.  Allah Says (interpretation of meaning): {….but they killed him not, nor crucified him, but the resemblance of 'Iesa (Jesus) was put over another man (and they killed that man), and those who differ therein are full of doubts. They have no (certain) knowledge, they follow nothing but conjecture. For surely; they killed him not [i.e. 'Iesa (Jesus), son of Maryam (Mary)]: But Allâh raised him ['Iesa (Jesus)] up (with his body and soul) unto Himself (and he is in the heavens)….}[4:157-158].

As for the “holy light” it is a pure lie that ridicules the naïve ones.

Even if you suppose that it is true, Allah, sometimes make some of those who do not believe in Him do something extraordinary, or undergo some unbelievable event to make them disbelieve even more and to try those who believe in Him to see such extraordinary events.  The Antichrist (Dajjal) will say to the sky rain, and it will rain and to the land grow and it will grow.  There are many magicians and charlatans who do many extraordinary things that are trials for those who see them.

Allah knows best.