The question which arises here is: How can all people be expected to believe in the one true God, given their varying backgrounds, societies and cultures? For people to be held responsible for worshipping the one true God, they all need to have access to knowledge of him. The final revelation teaches that all human beings have the recognition of the one true God imprinted on their souls as a part of their very nature with which they are created.
In the seventh chapter of the Qur'an (Al-A'raaf, verses 172-173),God explained that when He created Adam He caused all of Adam's descentants to come into existence and He took a pledge from them saying:
"'Am I not your Lord?' To which they all replied, 'Yes, we testify to it.'"