The biblical message is clear. Jesus said, "I am the way, the truth, and the life. No one comes to the Father except through Me" (John 14:6). The apostle Peter proclaimed to a hostile audience, "Nor is there salvation in any other, for there is no other name under heaven given among men by which we must be saved" (Acts 4:12). The apostle John wrote, "He who does not believe the Son shall not see life, but the wrath of God abides on him" (John 3:36).
Again and again, Scripture stresses that Jesus Christ is the only hope of salvation for the world. "For there is one God and one Mediator between God and men, the Man Christ Jesus" (1 Timothy 2:5). Only Christ can atone for sin, and therefore only Christ can provide salvation. "And this is the testimony: that God has given us eternal life, and this life is in His Son. He who has the Son has life; he who does not have the Son of God does not have life" (1 John 5:11-12).
Those truths are antithetical to the central tenet of postmodernism. They make exclusive, universal truth claims, declaring Christ the only true way to heaven and all other belief-systems erroneous. That is what Scripture teaches. It is what the true church has proclaimed throughout her history. It is the message of Christianity. And it simply cannot be adjusted to accommodate postmodern sensitivities.
Source: Jesus: The Only Way to Heaven - Jul 15, 2005 - Grace to You with John MacArthur
There are only two possible ways to God, two conceivable ways to God. One involves your work, your effort, your righteousness, your goodness. The other acknowledges that you have none of that which pleases God. It either involves something you do to please God or nothing you do to please God and there can’t be any other way. There is no third alternative.
There are only two possible paths to heaven. Either you contribute to your getting there or you don’t. Either you bring your righteousness to God and it counts for your salvation to one degree or another, or your righteousness is filthy rags that counts for nothing. So there are only two kinds of religions. Either you can be good enough to contribute to your salvation, or you can’t be good enough to contribute to your salvation. Either you have the ability to do something to please God, or you do not have the ability to do anything to please God. That is still the distinction.
Only two religions in the world, only two. The religion of divine accomplishment; you can do nothing, God has done it all. That’s the true Christian gospel. Or the religion of human achievement; you do something, God does something and together, relatively, you make it to heaven and that’s every other religion in the world, but the true one. Even many, many forms of so-called Christianity. The religion of human achievement says that you have things that you can do that please God. Your goodness matters, your religious activity, your ceremonies. This is the religion of works. This is the religion of merit. This is the religion of self-righteousness. This is the religion of the flesh. It involves what we do. Or there is the religion of divine accomplishment which is all of faith, all of grace, and all what God does. And they don’t mix. They don’t mix.
You put any law in grace, the Bible says, and grace is no more grace. You put any grace mingled with the law and you’ve corrupted law as the standard. It’s very confusing to be a legalist. It’s very confusing to think you can earn your way to heaven because you know you can’t be perfect and so you want to make sure there’s a little cooperating grace there. But they can’t be mixed. It’s either all of law or all of grace.
And the Bible says, “By the deeds of the law, no one will be justified,” Romans 3:20. No one. The Jews of Jesus’ day were just part of the worldwide satanic counterfeit religion, the system of human achievement. And Jesus assaulted their religion, attacked their religion.
Source: Two Paths, One Way - July 30, 2006 - Grace To You with John MacArthur