How would today be like if Martin Luther had not posted his 95 Theses?

The world will be drastically different

Explanation:

First of all, There would be no trace of protestants, because these are the rise of people who wanted reform. Martin Luther indirectly led to the rise of the idea of rationalism and the enlightenment. And without him, Many scientigic breakthroughs that occurred throughout humanity might have never happened. I could go on and on but these are the major consequences.