Philosophy says an issue or a thought is not valid unless it can be disproved. When I mention to the person of philosophy that the one true gospel is “the Mashiach died for our sins according to the Old Testament, He was buried and He rose again the third day according to the Old Testament”, he or she will say that the statement falls in the realm of faith, because it cannot be disproved. They say this is my opinion. The Greek word for opinion is heresias Or anglicized “heresy”.
But the one true gospel does not fall in the realm of faith, but falls in the realm of the grace of God. God grants grace to “a few” to accept the one true gospel. Grace comes before faith, just as faith comes before works. Faith without works is dead being alone, separated from the assembly where the one true gospel is preached. First there is the will of God, then the grace of God to the person, then the faith (there is only one faith, “the faith of Yeshua”), then good works. If you abide in my word, then you are truly my disciples, sayeth Yeshua. We abide by grace. We are saved by grace. We will endure to the end by grace.
The one true gospel is not a matter of faith, it is a matter of the grace and will of God. All the understanding of the Mashiach such as “God is love” and “Yeshua died for all people” and “there is no partiality with God” are matters of the grace of God. “The faith” follows the giving of grace by God.