Disputes between religious teachers are nothing new. In the Kālāma Sutta of the Aṅguttaranikāya the Buddha suggests a criterion to use in distinguishing between what teachings are worth following and those that are not – namely one’s own rational judgment regarding the results of the practice proposed.
The Kalamas who were inhabitants of Kesaputta sitting on one side said to the Blessed One: “There are some monks and brahmans, venerable sir, who visit Kesaputta. They expound and explain only their own doctrines; the doctrines of others they despise, revile, and pull to pieces. Some other monks and brahmans too, venerable sir, come to Kesaputta. They also expound and explain only their own doctrines; the doctrines of others they despise, revile, and pull to pieces. Venerable sir, there is doubt, there is uncertainty in us concerning them. Which of these reverend monks and brahmans spoke the truth and which falsehood?”
“Come, Kalamas. Do not go upon what has been acquired by repeated hearing; nor upon tradition; nor upon rumor; nor upon what is in a scripture; nor upon surmise; nor upon an axiom; nor upon specious reasoning; nor upon a bias toward a notion that has been pondered over; nor upon another’s seeming ability; nor upon the consideration, ‘The monk is our teacher.’
Kalamas, when you yourselves know: ‘These things are good; these things are not blamable; these things are praised by the wise; undertaken and observed, these things lead to benefit and happiness,’ enter on and abide in them.
Anguttara Nikaya 3.65, PTS A I 188