I am glad you stated this. Whenever a Catholic says Mary or a saint is "united" with Christ we are accused of deifying her or him.
Of course the head is united with the body!
Good for you! Light pierces the darkness! But then you must also admit that every Christian is within the Body, and has the full faith and power of the Head, and then figure out why it is that you are talking to the right pinky-finger or the left knee instead of talking to the head... And why you need an earthly priesthood to get you where you already are...
uh-oh... *POOF* you're a Protestant!