These concepts are worth less as you realize how much these beliefs have changed since their conception, that's why many are self-contradictory. The conception of hell, for example, has changed a lot over the centuries, until Dante Alieghieri introduced its structure in the Divine Comedy, hell was rather abstract.
If it is to speak specifically of suicide, it is a matter of interpretation, similar to the Jehovah's Witnesses equating blood transfusions and cannibalism, the act of ending one's own life would be against one of the commandments "Thou shalt not kill". But it is just that, a technism. The word "suicide" is not used expressly in most modern translations of the bible,but the act itself is referred, Soldiers to avoid surrendering to the enemy, sad lovers after the death of their partner, technically Samson's story ends in a suicide.
