The bottom line of Buddhism, is that they deny that God even exists. They believe that life and death are sort of an illusion. This may temporarily help you deal with your fears of this life and death, but it does no good when you consider reality. The main thing it does no good for is your problem of having sinned against God and the reality of Hell.
Buddhism is an impersonal religion of self-perfection, the end of which is death not life. The Buddhist belief system is centered around the Four Noble Truths which affirm that (1) Life is full of suffering, (2) suffering is caused by craving, (3) suffering will cease only when craving ceases, (4) this can be achieved by following the Noble Eightfold Path, which consists of right views, right aspirations, right speech, right conduct, right livelihood, right effort, right mindfulness, and right contemplation.
Some of the other beliefs are that nothing in life is permanent, that individual selves do not truly exist, that all is determined by an impersonal law of moral causation (karma), that reincarnation is an endless cycle of continuous suffering, and that the goal of life is to break out of this cycle by finally extinguishing the flame of life and entering a permanent state of pure nonexistence.