CREATE TABLE table_45947 ("Ethnicity" CLOB, "Islam" CLOB, "Christianity" CLOB, "Judaism" CLOB, "Buddhism" CLOB, "Other" CLOB, "Atheism" CLOB)

What is the percentage of Judaism associated with Christianity at 2.51%?
SELECT "Judaism" FROM table_45947 WHERE "Christianity" = '2.51%'
SELECT "Judaism" FROM "table_45947" WHERE "Christianity" = '2.51%'