THe road is always open. But, if you think Rome teaches Mary was Goddess, you neeed to purchase an orthodox Magellan because you are way off the road
The constitution of the old Soviet Union guaranteed religious liberty, too. The church is wise enough to tolerate many things it does not teach. Unfortunately, this can go too far, and lead to synchretism. The Jesuit missionaries to China were recalled when word got back that they were embracing confucianism faster than the mandarins were embracing Christianity!
Folk catholicism does, indeed, regard, celebrate, and treat the BVM as a friendlier deity than the Trinity. The cult of the BVM, in practice (if not in official dogma) is a para-Christian religion with an alternate deity, alternate revelation, alternate plan of salvation, alternate mysticism, etc. Just like Mormonism, which also provides point-for-point substitutes to Christianity.