Just imagine, how Spiritualism manifested itself in the past.
Ancestor worship may have fueled it. The desire to contact the loved one who had passed away must have been as important role just as it is does today.
Even today, Eastern Buddhists are known for their Spirit Houses which include such strange 'offerings' as cigarettes, food, Hell money, etc. That culture, is in many ways foreign to the West, but a study of those cultures can help us to understand how Spiritualism came about.
As we begin to look at ancient Spiritualism, it should be noted that Spiritualism touches in to, if not mimics, Necromancy. It should be noted that Shamanism also touches in with Spiritualism.
Happiness is the result of an enlightened mind whereas suffering is caused by a distorted mind.