Are you sure about all that? I write reviews and I know how many problems there are with bias and validity, with something like religion, which for much of the time you're talking about was a vassel, unfortunately, for politics there is much, much more room for inaccuracy, error and outright propaganda.
The crimes of religion where often exaggerated from day one through schism and sectarianism, each seeking to draw support, motivate existing supporters and demonise their opposition, then with the ascendency of secularism and atheism those "facts" where regurgitated, added to and repeated with much more vehemence.
An honest assessment of religion would find that it fares reasonably well in comparison to modern political ideologies, where religion had healing, hospitality and beginnings of medicine modern political ideologies had the atrocities of Mengala (spelling) or his soviet equivalents, even in the US and Sweden after the war there were widespread experimentation upon ethnic minorities.
Religion is given a very unfair treatment in the folk memory, often because people have highly personal reasons and have projected upon religion something they dislike, often with good reason, perhaps they've found people who represent well their worst suspiscions and decide that their generalisations are in fact true.
I dont actually proselytise or preach or feel any need to evangelise when it comes to religion, not at all, I dont talk about religion much in person because there is such variance, from people who give it too much credit, to those who believe its entirely discredited. It disappoints me when I hear old hackneyed myths peddled from people I otherwise respect though.