If you see Christianity as part of "childhood wonder," then you see God like Santa Claus. There's nothing of value that was lost, then.
A "logical mind" has nothing to do with believing in God or not. Until people STOPPED teaching logic, the evidence for God was considered so overwhelming by the educated that atheism was seen as a position that was extremely shaky from any rational perspective.
Why on earth would he think that Cain and Abel, which predated Romulus and Remus in the written record for approximately 1000 years, ,would be a "ripoff" of R&R and not the reverse? That isn't logical. It's silly.