Who inherits the questioner after his death, knowing that he is married to a Christian woman, and has full sisters, half-sisters, half-brothers, and separated parents?

Your statement that your Christian wife is not a Muslim but is a believer is contradictory. Christians are disbelievers and cannot be described as having accepted Islam or belief. Allah Almighty says: (Certainly, disbelievers are those who say, "Allah is the third of three") [Al-Ma'idah 5:73]. It is not permissible to describe them as believers until they believe in Prophet Muhammad (peace be upon him) and all the Messengers.

Inheritance is determined only after death. If a Muslim dies and leaves behind a father, a mother, a Christian wife, and siblings, then the father inherits the remainder after the mother's share. The mother inherits one-sixth due to the presence of siblings, who prevent her from inheriting one-third. The Christian wife does not inherit from a Muslim because a disbeliever does not inherit from a Muslim. The siblings do not inherit due to the presence of the father. A Muslim has the right to bequeath up to one-third of their estate to someone who does not inherit from them, such as their Christian wife or their excluded siblings.