This fails...philisophically... on so many levels.
Step one: Learn the term 'contingency' and this all falls apart.
i.e. The bird gives birth to another bird. The human gives birth to another human. Thus the bird and human share a common origin.
Now, this isn't exactly what you said, but your cosmology states we came from a singular origin, and you have taken THIS position in a univocal sense. This flash has a similar, albeit strange, approach to Spinoza.
I'll admit that logical syllogism above isn't great.
But, to claim that from the same origin we are all the same is to say that 3 children from their parents are the same. THEY are contingent on their parents (and the parents before), yet the are in many ways different (although admittedly the same).
The next problem:
Misconception of the big bang and matter that constitutes objects runs rampant, but I'll allow you to work those out.
I can't explain it in this small place. What I can say though is that this 'thinking' is the tip of the iceberg...a seeker of truth questions the premise, method, and conclusion so that it may yield the best fruits.