Well you did write ...

"...The existence of God, if possible, is unknowable.
Thusly, any progress toward knowing him is illusory and can only hinder progress in my own life."

I am informing you that there are other people namely the Saints and Buddhas that state the opposite which is the divine ground is directly knowable. That experiential knowledge is attainable by each and every sentient being.

So you may be hindering yourself by not reading what else is out there.

Bruce