Why should we have the right to end our lives, we do not have the right to take the life of others except in the case of protecting ourselves from a killer. Many diseases are killers and we have the right to kill them if we can, so there is no need to take our own life. Back to the case of someone trying to kill us, it's just like a disease we can't always be successful in fighting the threat, so should we just give up and kill ourselves.
God loves those who believe and those who do not and the same goes for me, you have no choice in this matter. That puts the matter of total free will to rest.