The concept of postulate in Kant's philosophy

Postulates play an important role in Kant’s philosophy. Kant’s understanding of this term differs from the previous tradition. For Kant, postulates are originally subjective propositions necessarily supposed as objective ones. Otherwise, the systematic theoretical cognition and compliance with the moral law become impossible. However, this feature of Kant’s word usage is hardly taken into consideration. That is why Kant is wrongly accused of atheism.