It does not matter whether you are a theist or atheist, what matters is sincerity, forgiveness, and compassion.
Dalai LamaWe should reflect on the idea that since the beginning of time sentient beings have been mentally unstable because they have been slaves of delusion, they lack the eye of wisdom to see the path leading to nirvana and enlightenment, and they lack the necessary guidance of a spiritual teacher. Moment by moment they are indulging in negative actions, which will eventually bring about their downfall.
Dalai LamaThe immediate source of a mind... must be a mind which existed before the conception took place; the mind must have a continuity from a previous mind. This we hold to prove the existence of a past life.
Dalai Lama