The example is based on a faulty premise. You're saying you consider praying to Mary to be a sin, which is all well and good. However, since nobody actually prays to Mary, your point is meaningless.
it's communicating with the bodily dead which is a scriptural no no and has been since long before Christ. It's sin.
That's one opinion- about 1.2 billion people disagree with you.
It isn't an opinion. It's scripture. If it were an opinion, i'd offer it as such. It isn't. But, then this is what I'm talking about isn't it lol.