religion as a system of superstition
Risking the possibility of being labeled a heretic or worse, religion can be seen as a form of system of superstition by an outsider since we often do things or avoid doing others in order to please God. The thought that some action done or avoided has control over of life or fate could easily be laughed at.
For example, in the Catholic doctrine, which I grew up with, if a person fails to go to church on a Sunday, he/she has automatically committed a mortal sin and fallen off God’s Grace. This means that, in the case of that person’s death, he/she would be cast to hell or the purgatory — mortal sin. I grew up with this “superstition” engraved in my soul.