I read something I found peculiar

[Ace Otana]

Yet if I used the word 'soul' I'm sure you'd have a good idea what I meant in many contexts.

I'm assuming you meant spiritual soul. The supernatural sense.

It isn't something you'd seek to prove, just like 'God'

If it's the spiritual, supernatuaral sense then yes it is something to try and prove. It is a claim and is unproven. Evidence is required.

Desciptions may well vary greatly across civilizations, but the fact that it's (the soul is) there in all of them is a strong indicator that something is tangibly present.

The fact that alot of people have delusional beliefs about this "soul" does not equal it's existence. Evidence is reqired.

God is a formulated answer related to this condition and explains and satisfies this side of our nature

It explains the unknown and denies some answers that science presents. God is a huge claim that requires evidence. God is an answer I will never accept without evidence.

It answers the 'why' questions perfectly

Anyone can answer any question with anything. Goddidit can answer every question just like santadidit can but it does not mean it's correct. God is a baseless assertion, nothing more. Yes it can answer questions but there is no evidence to suggest that it's the correct answer. No sources are pointing towards the god conclusion.
I can say the flying teapot answers the why questions perfectly, it doesn't make it so though. There's no evidence to support that assertion, just like god.

The logic goes: perfection produces something less perfect. Hence everything proceeded from God who is more than the sum of everything.

Yes a good point but you have just raised an interesting question. Though this logic may apply to those who are less than perfect like us, does it also apply to your god? If it does, have you just admitted that it is in fact beyond gods ability to create something as perfect as himself? Wouldn't that mean god is not all powerful after all? He cannot create something as perfect as himself? Is this where god's powers cannot go? He is supposedly all powerful and yet there is something that he is entirely powerless over? Also, not being able to create something as perfect as yourself maybe debatable. Does cloning prove that wrong? Cloning is duplication, in a sense creating something as perfect or inperfect as the one your cloning.

You have only raised further questions frodo.