God is so clear about how we are acceptable to Him. The Bible says, “For God so loved the world that He gave His only Son, that whoever believes in Him will not perish, but have eternal life” (John 3:16). And many times Jesus talked about coming to give us eternal life. He stated this quite directly: “…it is my Father’s will that all who see his Son and believe in him should have eternal life” (John 6:40).
If we could come to God through any religious figure (ie. Buddha, Allah, Mohammad, Hindu gods, etc.), or through any religious effort…then Jesus did not need to come to earth and die on a cross for our sins. But this was God’s plan–God Himself paying for our sin, so that full forgiveness could be given to us. “For the wages of sin is death, but the free gift of God is eternal life in Christ Jesus our Lord” (Romans 6:23).
To believe in Jesus means life; to not believe in Him means remaining guilty from personal sin and under God’s judgment. God offers forgiveness to any who will come to Him.
If you would like more information on how Christianity compares with other major religions, such as Islam, Buddhism, Hinduism, please see the article: Connecting with the Divine.
And if you would like to see a very helpful article that explains how we know that Jesus is God, please see: Beyond Blind Faith.