I don't have any meaningful desire to research the first quote about Spanish Judaism. The second paragraph though does interest me. The Luther snippets don't actually reference a primary source (typical of Internet propaganda). They reference "Whitford" and "Friedman." Neither of these references is to an actual primary source... so if it were me grading Ms. Coopersmith's paper, she would be marked off.
In regard to the 1523 letter, Ms. Coopersmith leaves out the fact that the letter Luther wrote to the converted Jew Bernard was accompanied by his book
That Jesus Christ Was Born a Jew as a present. Bernard also was married to Carlstadt's maid.
Read the letter, and notice that there's nothing at all relevant to how Luther felt about the "blood" or viewing converted Jews as not actual Christians. Luther ends the letter saying, "
I hope by your labor and example Christ may be known to other Jews, so that they who are predestined may be called and may come to their King David..."
Ms. Coopersmith then says, "
Luther, like the people in his time, believed that New Christians were still Jews even though their baptism was sincere." Ms. Coopersmith though leaves out the fact that Luther referred to all sorts of people by their nationalities, so this is an inane point. Even judged by today's standards, many converted Jews refer to themselves as "Jews for Jesus." Ms. Coopersmith then says, "
Luther consistently referred to Mathew Adrian as a Jew despite the fact that Adrian was a New Christian who was helping Luther with the Protestant Reformation (Friedman 25)." "
Mathew" is a typo, so another demerit for Ms. Coopersmith. While I don't have access to "
Friedman 25" (as far as I know), I did a cursory search of LW for "Matthew Adrian," of the three hits, only in one does Luther say in a letter, "
Greetings. Matthew Adrian, a Jew from Louvain, has written to me..." In the context of letter, Adrian is brought up because he wanted to teach Hebrew at Wittenberg and wrote Luther. Luther speaks of his scholastic abilities in glowing terms. There's no hint that Luther had any predisposition of looking down on him as less than a Christian or having some sort of tainted blood.
Once again, if you're going to shoot at Luther, aim at the correct target. There's plenty to hit. Cut-and-pasting inferior college papers isn't a good weapon. it may backfire on you.