The answer to the question - If not God, who created us? - is that there is only God.
God is One without a second.
God is Oneself.
Oneself conceives and perceives itself as diversified.
All diversity is Oneself. The answer as to - What is the cause and purpose? - is simple. The cause of all this diversity is loneliness.
The purpose of all this diversity is companionship. Companionship equates to have a loving friend, a companion. In conclusion. All this is God.
All this is Oneself.
There is no such thing as division.
There is only diversity. Diversity is a blessing and incredibly precious. The wise thus says:
Know all is Self; Feel only Love.
Alternatively.
Know all is God; Feel only Love.
Same thing.
It is very simple.
It is very true.
It is good enough.
~ Wald