On a side note, if you want my beliefs, then yes, life IS just a pure, giant coincidence/chance. Life spontaniously came into being out of chemical reactions in the primordial soup for no real reason, and life evolved for no real reason other than to survive. And life survives for no real reason other than to pass on its genes to the next generation.
Is it all pointless? Maybe/likely. Does that make it worthless? Hell no. No pre-determined purpose means lifeforms can choose their own purpose in the cosmos! Life would only be worthless if it was “created” for a single task by some narcissistic being to worship it or be punished.
And who knows, maybe IF we were “created”, it could still be that our purpose IS to evolve. To become something greater than what we started as.
It’s like in the penultimate chapters of Attack on Titan.
spoiler
Where TL;DR Zeke initially resigns himself to the Rumbling as extinction is a part of evolution, and those who cannot survive to pass on their genes have no point in living. Except Armin makes him realize/remind himself that things such as running beneath trees, reading books, or playing baseball may not have any point in surviving, procreating, and evolving, but that those actions still have purpose because it makes people happy.