Many examples can be given to this question. There are huge varieties of unfaithful beings in this world. One I can tell you is a person who asked me "Ask Jesus to pass me in my maths exam." I was shocked when they said that to me. Like, literally! If you have faith and believe in God he will help! But if you don't believe in him but ask others to pray, how will he?
Samsara is the cycle of rebirth. In the current life, people experience consequences of their past life, and in the next life, people experience consequences of karma in their current life.
