I've written about agnosticism, the burden of proof, and why theism but not atheism is preposterous (anachronistic) below:

https://medium.com/interfaith-now/thomas-huxleys-scientism-and-the-agnostic-s-false-modesty-20862b2be550?sk=96ffb743628853c05ab4cb31bee30534

https://medium.com/interfaith-now/do-atheists-and-theists-have-the-same-burden-of-proof-24a4bc0013d1?sk=ade555e68cef719b6d01fec2dba9371c

https://medium.com/interfaith-now/atheism-and-the-burden-of-refuting-the-preposterous-53aba4657168?sk=750116916d079705a9e0e1d97296bcfa