Again, you are completely mistaken. The fact that the dogmas were not defined, does not mean that they were not recognized. One of Luther's most passionate sermons on the Holy Mother was preached on the Feast of the Immaculate Conception.
Also, he is not praying to statues. He is just praying. The statues are another piece of artwork in the room.
By common Protestant reasoning, these are idols and someone might be inclined to pray to them.
"One of Luther's most passionate sermons on the Holy Mother was preached on the Feast of the Immaculate Conception."
Its a great sermon, too. But I think you'll find that the the feast was not called the "Feast of the Immaculate Conception" back then.