Oh man why did humanity invent the idea of heaven. It's the most terrible thing ever conceived by man. Paired with the fact that so many people are illiterate, you get idiots doing anything they can to get closer to their Gods.
These three sisters are deluded beyond belief, I can't even imagine the thought process: "We cant fight, but lets go treat those Muslim fighters to our vaginas. God will be really pleased with that." And then the other retarded sister must have said, "We're not even virgins though, Islam hates non-virgins, so lets take our children too, god will really be pleased if we sacrifice their virginity to Islam". And then the third sister must have been like, "That will definitely get us into heaven".
Utter utter delusion.