Religion, generally speaking, is followed by those who have no idea of how to deal with their fears. (Of death, being alone and unloved, etc.)
Religion can offer some relief for those fears. but the problem is that it is a relief of distraction and does not remove the fears, it just buries them more deeply in the psyche of the believer and then, many other patterns of dysfunction appear due to these deeply held fears.
The current state of humanity proves that religion is not an effective tool at all, but a hindrance to the evolution of humanity.
To let go of fear, you must first embrace it.