Hindus : Do you believe in the concept of God being merciful, if that's the case then how is karma applicable?

The concept of a personal god in Hinduism, is of the belief that God is merciful and has all the emotion of a human being. The word 'Karunyasindho' meaning 'Ocean of mercy' appears in many prayers of Hinduism to Gods who take personal form in human beliefs. For Eg, Ganesha, Krishna, Subramanya etc. The theory of Karma is a vain effort by ancient religious scholars to define many simple and often unexplained situations in life. Both are different belief systems within the religion, people dont understand the difference between the two and i am sure you wont find better answers by mixing both and asking a question.