Are Catholics and Protestants that different?

Mariology^* is all things Mary though, not just whether she was Jesus' mother. Nobody Christian disputes that as far as I am aware. There are plenty of dogmatical differences though - the immaculate conception, the assumption of Mary and the perpetual virginity of Mary spring to mind.Not wanting to beat a dead horse or anything, but in line with the OP, I don't think differences in dogma can ever be resolved. That's why it's called dogma.

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^* Not to be confused with MariolatryEdited by Modulous, : added footnote.

How can it 'go beyond Mariology'? I see that some protestants accept that it is the case, but that doesn't mean that there isn't a divide. Catholicism has it to be true - maybe some Catholics still don't accept it as true, but that does not mean it isn't Catholic dogma. Protestantism doesn't have a firm stance on it. That's a divide. The thing with Protestants is that they cannot be easily said to have a firm stance on many doctrines like this due to their structure (There is an easily defined authority on dogma in the Catholic church).