Only Christianity Offers Unearned Grace
Every worldview claims that your destiny is tied to your effort and ability. Judaism strives to follow every law in the Pentateuch.
Islam is based on how well you obey Allah, and even if you do everything you can your destiny is unsure. He may decide in the last moments that you are not fit for "heaven."
Hinduism is an eternal struggle to escape reincarnation, where you are constantly paying for the sins of a previous life. No one can answer what you were paying for in the first life though.
Buddhism asks you eliminate all desire so you can be free from suffering, ironically making non-desire your one desire.
And what about the atheist or agnostic? In that case there is no destiny or afterlife to speak of, so one must achieve all the pleasure they can in this world. But read the stories of those who have achieved fame and fortune, they will tell you it does not bring fulfillment.
All these worldviews hinge on your effort to become "good" or "worthy." All except Christianity.
Jesus said salvation is not for you to earn, but is a free gift. Paul says in his letter to the Romans:
“But God proves His own love for us in that while we were still sinners, Christ died for us!” Romans 5:8 HCSB
Even those who reject Christ can know they are loved by Him. No other religion or spiritual leader sacrificed their life so that we may receive salvation as a free gift.