I'm sure there are some politically motivated dramatizations around Christianity in Europe, but there is no shortage of examples of abuse that resulted from rhe Church having too much influence on the state at different points in Europe's--or, for that matter, Christendom's in general--history:
The truth about Galileo and his conflict with the Catholic Church
It seems to me it is both counterproductive and bizarre for any proponent of secularism to focus on dramatizations of Christian Europe when there is no shortage of examples of abusive, corrupt, and draconian practices endorsed by the Church both in earlier periods and the present day. In my opinion, those should serve as a substantial reminder of why separation of church and state is a crucial principle largely written in the blood of those who suffered under theocratic rule. Attempts to whitewash this (talking generally, not about you or anyone else in this thread) seem to me no less harmful than attempts to inaccurately dismiss Christianity's contribution to the shaping of modern Europe.
Any serious critic would probably do better to focus on an issue like the Church's facilitation of child abuse or contribution to the spread of HIV due to its refusal to embrace reform in these areas than to focus on historically inaccurate accounts.