Ultimately, what you believe about reincarnation boils down to your own spirituality and whether or not the idea of multiple lives makes sense to you and your place in the universe.
On the other side of the fence, Christian scholars argue that not only do the biblical quotes cited by reincarnationists not support the concept of reincarnation, but that other sections of the Bible specifically speak out against the idea.
Even though the general ideas of reincarnation have spread around the globe for centuries, for the most part, historians agree that the concept of rebirth into a new life originated with Hinduism.
It's easy to confuse the human personality with the soul, but the two are quite different as evidenced by the many lifetimes and different personalities a soul is believed to assume, according to common reincarnation theory.
In Hinduism (and many other beliefs of reincarnation), the act of suicide is a failure of the soul to resolve a karmic entanglement and learn the lessons that would achieve an evolved spiritual state of being.