How to know if the person descends from a Jew

The difficulty of knowing if the person descends from a Jew in Brazil is more in the people of the interior of the northeast and in the north, because there are families that do not even have a birth certificate and there are people who do not even know who the mother or father was. And he had in Portugal Jewish children who were taken from the Jewish family force and given to Catholic families. SO YOU CAN KNOW BY THE YDNA DIFFICULTY BY THE MTDNA, AND ALSO IT DEPENDS ON THE SITE THAT THEY ARE BEHIND THE ADOPTION OF THE TO KNOW IF YOU JOIN THAT WITH GENEALOGY AND GENETICS BECAUSE OY DNA DELE OR MT DNA WILL BE DIFFERENT FROM THE FAMILY THAT ADOPTED IT ...
IF YOU ARE FROM A NEW AFFONSO FAMILY AND YOUR DNA SHALL NOT BE EQUAL TO THE PEOPLE OF THAT FAMILY AND NO SURNAME AFFONSO.
MY MOTHER IS MENDES BUT I DO NOT HAVE PORTUGUESE ORIGIN BY MOTHER'S SIDE IS AFRICAN HAS NOT DONE THE COMPLETE TEST ON THAT, MY Y DNA IN 37 MARKERS IS ASHKENAZY-SEFARDITA I HAVE NO RELATION OF SURNAME NEW NOT EVEN RELATIVE NEXT TO THIS SURNAME NOR WITH NO MALE SURNAME MINE OF MY FAMILY. . ABOVE COIMBRA DIFFICULTY IF THEY FINISHED FENÍCIO GERM THAT THE GENETICS OF THEM IS A LITTLE DIFFERENT ..
If people of unusual Portuguese surnames most have European genetics and a minority has Semite non-Phoenician genetics as the Arabs were very few people in Portugal, since the Moors are not Semitic soon have a strong possibility of having their origin as Israelite or have.