I am a student of Peace, Grace, and as such know only about people. In Religion and out of Religion, we essential wish for the same things. The Soul is seeking, and perhaps that's why the greatest instinct is Survival, and so we do or act in such a way as is necessary to stay alive or ultimately find our True Source.
Christianity speaks of seven deadly sins and the East speaks of five. They can attempt to address your question:
1. Ego. It is the nature of the Ego to analyse, separate, chop things up. It gets joy in putting things in boxes, in pleasure; in name and fame. It exists largely in the mind and will generally seek its own selfish instincts. There are no 'we' and 'ours' in the Ego, but only 'I' and 'mine.'
2. Anger or wrath is very difficult to conquer, and has lead to many deaths and devastation. Anger is present because the mind is restless and not peaceful or serene.
3. Lust/desire/passion. This is also tied up with the next one called Attachment. We use the spiritual energy in a very carnal or promiscuous way and this leads to anger and Greed, the 5th. Desire weakens us and makes us more animalistic and brutish.
4. Attachments. Sometimes called Maya or illusion. We see the world as real and permanent and become attached to house, family, car, food and wine and many things. We forget that this whole thing is ran by a Cosmic Will and that we are only instuments. We see the illusion, instead of the Reality, and feel falsely, that we are in charge.
5. Greed. This also increase the desire for material gain or rather an enslavement to material gain, as well as power and pelf. We can only do this, when empathy is missing and as such we forget that Humanity is our brothers and sisters.
This is what makes us humans prejudicial and judgemental. In this mad quest for survival and with an ignorance of Knowledge, we become insecure, fearful and resentful and do wrong things, Religion or no Religion. We are essentially human, a Soul or Souls in Isolation, and on its/their way HOME.
Finally, Spirituality asks us to change our own nature, but even in your question there is a looking 'out' rather than 'within' to prayer, Silence; Solitude, Service ... as it is perceived by many to be more comfortable to do so. In Love and Light.