Sentence:  From the separate little tracts and fragments which we have last noticed, (as well as the greater works, which contain a fuller development of his views on this subject,) it appears he slighted what has been termed Natural Theology. He was content with the Bible, without which Natural Theology is a <WSD>dabble</WSD> of inconclusive presumptions, and in connexion with which, however pleasing as a speculative inquiry, useless as a canon of faith, or a rule of life. 
Meaning of the word marked with <WSD> tags:  An act of participation in an activity in a casual or superficial way.