Protestantism has done more to destroy Christianity in the West, than any other movement, in church history.  It started with the fact that Protestantism contained the seed of not only its own destruction but the destruction of Christianity per se. We now call this seed "secularization" and its recent offspring "secularism".

Were is not for the Protestant Reformation the church would have maintained its unity  and advanced the internal movements of true reform that were already at work by the early 1500s.  

 The false doctrine, expounded by the reformers, of justification by faith alone, resulted in a shallow  religious faith. The idea that each individual may interpret scripture for himself, has served to make of Christianity and morals a "do it yourself" project that now has "legitimized" every erroneous notion related to faith and morals imaginable. 

Protestantism has left the West lacking in belief and heart. It has stripped the West of its very soul.