I am the way, the truth, and the life. No one comes to the Father except through Me. - John 14:6, NKJV
Karl Barth, one of the twentieth century’s premier theologians, said that all religion is man reaching up to God in his own way, according to his own terms, on his own merit, in his own strength. Christianity alone is God reaching down to man.
All non-Judeo-Christian religions are an expression of man’s defiance of God, including His way, His will, and His work. If you ask most people today why they think God will let them into heaven, they will say something like, “I try to be good. I go to church. I’m not perfect, but I believe God will weigh my good deeds against my bad deeds, and I hope the good outweighs the bad. If it does, He will let me into heaven.” It is man’s pride that believes God somehow owes him a heavenly home or eternal life as a reward for good deeds or extra effort or earnest sincerity. But heaven cannot be earned or deserved or bought, which is why God has reached down and just given us Jesus!
From God's Story