i just read the concept of Ishvara in that link (Advaita Vedanta)
then that is same how i see God,
so i might be considered as advaita
Then i also agree with Srimad Devi Bhagavantam, there is said creation is without begining (its not mean no creation), , that is cycle , just like our mother give born to us in this life, but before we born, we already born in another place (no begining point)
then see this cycle of Creation-sustenance-annihilation
is same with what i receive from Tantric Buddhism.
We also use term soul, because this term is only a term , just like we call another person with his or her name, but in fact this person is composed of different elements.
Anyway, this is a basic to answer the doubt from individual soul
Then in different case, the answer might be also different according to the illness of the person.
Acctually the most important is doing the practice to realize Bhagavan.
Because, in the fact :
Peoples not always need to know to much about this kind of theory if they can doing practice with peace mind (if not distrubed by question from self), just like a person who cant read anythings but he or she only chanting Hari Nama with pure devotion and peace mind, she or he will realize the Highest without know the theory too much like an scholar.
But a scholar who never practice and know many theory, sometimes they cant get peace in mind because so many distrubing question rise from mind who not pure.
So in this term i dont say the theory is not important, but they become usefull if we can use it in right way.