wardaddy:
Not to be writing this with any sense of disrepect, but are you referring to the Virgin Birth of Christ, i.e., by the power of the Holy Spirit was Incarnate of the Virgin Mary and became man [from the Nicene Creed]. You are correct, this would indeed be a universal belief of all Christendom.
Immaculate Conception refers to Mary being given a special Grace by God when she was conceived thru the normal human relations between her Father and Mother.
Quite right....immaculate conception is quite a lot more than merely acknowledgement of the virgin birth indeed