arthra
Baha'i
And with those who do not have a particular belief, with varying degree of understanding and achievement in terms of spirituality, will be (which is really personal believe) free (and become a being greater than mortal), reincarnated, or bounded in this world (which is what we called ghost, or of course for other reasons such as Necromancy). This I believe also apply to anti-theists.
In my belief the after-life is not defined as some but we do not believe in reincarnation... nor do we believe the soul is "incarnated" in this life, rather the soul is a spiritual light well reflected when we live a life free from material attachments and having virtues. We do not believe we will become "greater than mortal" as the spiritual is already above time and material things. Nor are there demons or ghosts..these are more based on superstition.
The rewards of the other world are the perfections and the peace obtained in the spiritual worlds after leaving this world; whilst the rewards of this life are the real luminous perfections which are realized in this world, and which are the cause of eternal life, for they are the very progress of existence. It is like the man who passes from the embryonic world to the state of maturity, and becomes the manifestation of these words: "Blessed be God, the best of creators." The rewards of the other world are peace, the spiritual graces, the various spiritual gifts in the Kingdom of God, the gaining of the desires of the heart and the soul, and the meeting of God in the world of eternity.
~ Abdu'l-Baha, Baha'i World Faith, p. 324