Scripture
The generalized term Scripture is used to refer to religious texts from any religion. The intent is to avoid reliance on specific Judeo-Christian references that only represent half of the world's population. When speaking of universalist ideas it helps to make them as universal as possible.
Scripture is the foundation of Doctrine, but Doctrine can also include interpretations and traditions introduced by religious leaders and institutions over the centuries. Doctrine can also refer to non-religious codifications of belief.
Secular and Progressive people have been reluctant to define their own doctrine, fearing it will become dogma and undermine their commitment to science and reason. This has hampered efforts to rally around any holistic common cause.