In an age when every branch of inquiry is being subjected to reasonable criticism, it would seem that the origin and growth of religion should be investigated from beneath the surface, and that all the facts bearing upon it should be brought forward as a contribution to our fund of general information. As well might we hope to gain a complete knowledge of human history by studying only the present aspect of society, as to expect to reach reasonable conclusions respecting the prevailing God-idea by investigating the various creeds and dogmas of existing faiths.<br />The object of this volume is not only to furnish a brief outline of religious growth, but to show the effect which each of the two forces, female and male, has had on the development of our present God-idea, which investigation serves to accentuate the conclusions arrived at in the Evolution of Woman relative to the inheritance of each of the two lines of sexual demarcation.