Amazing Creation

How can people think that the earth was just created by chance? 
Just look at reptiles for example: (I know what your thinking...Really reptiles?? Just keep reading :)
There is the category of Snakes :
There are venomous and non venomous snakes 

Non-Venomous:
--Constrictors (Ball python=small, Anaconda=large)

Venomous:

--Nurotoxins: fast-acting; attacks the nerves, causing blindness, paralysis, or suffocation...OUCH! ( King Cobra )

--Hemotoxins: slow-acting; attacks the red blood cells and blood vessels, destroying circulation...OUCH AGAIN! ( Eastern Diamondback Rattlesnake)

How could all this be created by chance??