Prove it straight from the pages of your own Bible!
Your eternity depends on your willingness to understand and believe the true Gospel! Yet the Apostle Paul warned the Christians of his day, "For if he who comes preaches another Jesus whom we have not preached, or if you receive a different spirit which you have not received, or a different gospel which you have not accepted—you may well put up with it!" (2 Corinthians 11:4).
Frankly, millions of sincere men and women have put up with a false gospel. They have been deceived all right—far too easily deceived. Why? Because too many have failed to obey God's command to "prove all things" (1 Thessalonians 5:21, KJV). Jesus Christ said, "The time is fulfilled, and the kingdom of God is at hand. Repent, and believe in the gospel" (Mark 1:15). Have you believed the same Gospel, which Jesus preached? You need to be sure! There are many, many "gospels" being preached in the world today! Have you ever heard something like this?