John 13:35 "By this all will know that YOU are my disciples, if YOU have love among yourselves.”

So Jesus test for true religion or spirituality would be in part, that it's members would display love for each other AND even their enemies.

Greek: Term "Love" def: [a·ga′pen] A principled love for the welfare for another's well being, dignity, respect, and compassionate treatment.

Hmmm. Kind of hard to love your enemy if your blowing his brains out. Can it really be the true religion with Shiites Muslims Killing Sunnis Muslims, Shinto's killing Buddhists, "Christians" killing other "Christians of a different nationality (British, German, American, etc.). You atheists in have blood on your hands too (think Russian history, Chinese History and so on and so on.)