Truth is the goal, don't lie to yourself to make yourself better, that's a rocky foundation. Know yourself, know what is real and what is not. If you don't, you'll be stumbling through your life blind.
How can you be 100% sure that any characteristic belongs to your real self ? Maybe it has to be built by hard working. Gain level .
On topic: Religion is madness at a socially accepted level and goes well with Nietzsche's quote "Madness is the exception in individuals but the rule in groups."
Religion has it's own good parts as a tool for one's spiritual growth, introspection, acceptance and hope maybe but it goes bad when it meets the situation in the quote above. "God" is a very subjective matter. Someone's definition of "God" might be more evil than one's definition of the "Devil". "God" can serve also as a tool for easing someone's burden of his own Ego. Can mean imprisonment of desire.