“Absorb what is useful and discard what is useless.” ~ Bruce Lee
In Bruce Lee’s day, martial arts were rigidly separated by various styles. He was a pioneer in taking what worked from various martial arts styles and adding them to his skill set. He took what was effective and discarded what wasn’t.
This principle can be applied to most things in life. Including religion. Religions tend to be separated according to specific and inflexible doctrines, and followers tend to discard all other doctrines as false. But in reality, there’s a bit of truth and error in all religions. What if we were to just take what is useful and discard the rest?