Many people think learning Greek they would understand more of the NT. Protestants have that habit and if we try to learn by ourselves the Bible and try to interpret everything, we could fall in the same mistakes they have. For instance: “Jesus Christ brothers”. Protestants say: in Greek, the word “brother” means no other than the son of my father, so as this is said so in Greek, Jesus had two brothers at least.
Do we need to have the same mistakes??Are we, Catholics, going to doubt our Mother, Mary, is pure??
Like this, there are many wrong interpretations from those groups.