Can religion “establish an absolute truth”?
Not sure how to answer that. I expect that we might agree on the definition of an "absolute truth", meaning, something that everybody must agree to or suffer the consequences of being wrong. But the term "religion" as you appear to be using it is at best imprecise and in the end it might turn out to be loaded.
As far as I am concerned, absolute truth just "is", knowing WHAT it is is the question. Is that what you mean by "establish"?
No, you’ve got it backwards. Absolute truth establishes religion.
Please think about it a little.