When Martin Luther posted the 95 Theses it was written in Latin because the debate was intended for a learned audience of clergy and professors. They were soon translated into German, however, and quickly spread across Germany.
His intention was to reform the RCC, not to form a new church.
As to your point on attacking Protestant churches, I believe anything with “ELCA” in the title will have a slew of posters damning this “church” also.
I probably will not get any adversity by saying the ELCA is definitely NOT a Christian church anymore.
God Bless
Whatever you my think his intentions were, his actions set in motion fragmentation that inhibited the spread of Christianity and insured more of those born into Christian countries would be damned since there were thousands of "Christs" to pick from. Naturally, only the spirit could tell them whether theirs was the right one or not and the majority of those alternative "Christs" didn't dictate major behavioral changes since everything revolved around how the individual interpreted scriptures anyway.
Whether you think he was right or wrong theologically, it's a fact that he did the wrong thing by leaving rather than reforming.