Those links put forward some spurious propositions. For instance ...
"If God is imaginary, then religion is a complete illusion. Christianity, Judaism and Islam are pointless"
Well, that's nonsense.
The point of "religion" is not to be proved correct about the existence of a supernatural deity.
The point of religion is to create order.
Order in our lives, and order in our minds.
Many people, whilst not believing in a divine creator (or in Father Christmas, or that Elvis is alive and living in Croydon) ... they still believe that we should live our lives in a way that is essentially consistent with quasi religious principles.
You might call them Humanists.
For such people, the religious guidelines handed down through the generations are important. Belief in a divine super-being is not important.
Hence ... even if God is imaginary (Ha! D'ya think?) ... religion has a value.
Those links seem to be saying ... "You MUST believe in the super-deity"
Well, that's just not true.
And the real answer to the question "Why doesn't God heal amputees" is ...
... If there is a God, then he's an inconsiderate little sh!t.