Where do you get the idea that the development of the human being has a purpose . in all the thousands of years of its development its made some terrible blunders, killing millions in its wars and conflicts, usually to no purpose at all, and will eventually totally wipe itself out of existence
Is that what you call a purpose of life, with or without a God ?If you consider that all life forms have a purpose, perhaps you will consider the purpose of such life forms such as the common cold, or cancer
If you believe that all life forms have a purpose, perhaps you will consider the perpose of life forms such as the common cold, or cancer which must according to your theory have some useful purpose. Seems rather difficult to assign a God given purpose ti it doesn't it ?