In the Book of Romans Paul of Tarsus sets down one of the cornerstones of his theology : no man can be justified by works , only through faith is the justification of grace.
In other words Paul is saying that that only faith and not works can count for righteousness.
This Christian doctrine is similar to Salvation in Islam that is purely by the Grace of God Almighty – while deeds are merely an indication of the reception of His Grace.
وَاللَّهُ خَلَقَكُمْ وَمَا تَعْمَلُونَ
It is God who created you and all your actions (37:96)
وَمَن يَتَوَكَّلْ عَلَى اللَّهِ فَهُوَ حَسْبُهُ
And he who relies entirely upon God will find Him fulfilling (65:3)
The big difference is however: Islam teach a believer can attain paradise by the mercy of God without ‘god’ having to require a human sacrifice!