religion is involved in around 7% of conflicts out of 1763 surveyed cases.
Interesting. I'm not familiar with the work. But off the top of my head I would say it would depend on how you defined "involvement".
Can't you include WWI? Both sides with god on theirs?
WWII? Wasn't the Final Solution an attempt to eradicate Jewry? Had it been successful, it would also have practically eradicated an entire religion.