Ah... but there is a scripture with the answer to this question.
There was a tribe called the Kalamas in ancient India, and they complained:
"There are some monks and brahmans, venerable sir, who visit us. 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 us. 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?"
Every religion proclaims its own truth, and the error of others. The Kalamas asked a reasonable question: How do we tell which one is correct?
The answer given was:
"Yes, Kalamas, it is proper that you have doubt, that you have perplexity, for a doubt has arisen in a matter which is doubtful. Now, look you Kalamas, do not be led by reports, or tradition, or hearsay. Be not led by the authority of religious texts, nor by mere logic or inference, nor by considering appearances, nor by the delight in speculative opinions, nor by seeming possibilities, nor by the idea 'this is our teacher'. Kalamas, when you yourselves know: 'These things are bad; these things are blameable; these things are censured by the wise; undertaken and observed, these things lead to harm and ill,' abandon them. ... Kalamas, when you yourselves know: 'These things are good; these things are not blameable; these things are praised by the wise; undertaken and observed, these things lead to benefit and happiness,' enter on and abide in them."
That is a good answer because it is not simply asserting "My religion is right and the others are wrong." It is advice to try things for themselves and see what works. Yes, what you try should be limited by "praised/censured by the wise", but that still leaves a great range of possibilities.
See the Kalama sutta, Anguttara Nikaya, 3.65
for more details.