A more scientific way to define what is religion, atheism and agnosticism should be base on the side of the brain being used. Concepts like God come from the right brain. But, there are other perceptions that are also generated this way. Mother nature is a right brain concept but is not called religion using the current subjective standards that can be manipulated with politics.
The brain side would create an objective standard not subject to the liars and con arts of politics. Below is a chart that shows and compares the types of perception as a function of which side of the brain processes which types of information.
If we compare conservatism and liberalism, liberalism is about feelings whereas conservative is about ideas and logic. That is the first criteria and results in liberalism scoring one for religion, and conservative is more scientific.
The next criteria is detail versus big picture. Liberal is more ends justifies the means including using crime with the IRS; win at all costs even by cheating. The score is liberal is religion=2 conservative=0.
The third is facts rule (left) versus imagination rules (right). Progressive is about unproven changes that don't have the facts yet. Conservative stick with what has the data due to longevity. Liberal is religion=3.
The fourth is words (left) versus symbols. I would give the left brain to liberals since PC control is big on language. Conservative is more about mom and apple pie, family, liberty, freedom which are all symbols. Liberal=3 Conservative=1
The fifth is present and past versus present and future. Conservative clings to the past while progressive is about the future; so liberal=4 and conservative=1
Maybe others can continue this as an exercise. But my calculations have the liberals more right brained and therefore religious. However, neither get a perfect right brain score, therefore both are agnostic, with liberalism having a more religious agnosticism.