Not only is the existence of a proto-Indo-European culture generally accepted in academia, it also is consistent with Biblical accounts.
Using the term ‘Easter’ for Resurection Day is limited to English I think, with most languages using a cognate of the Hebrew ‘Pesach’ (Passover) for the day.
You wrote:
“Not only is the existence of a proto-Indo-European culture generally accepted in academia, it also is consistent with Biblical accounts.”
It is not accepted in academic circles - nor is it Biblically supported - that there was even a cursory connection or influence between ANCIENT inhabitants of Mesopotamia and Germanic peoples.
“Using the term ‘Easter’ for Resurection Day is limited to English I think, with most languages using a cognate of the Hebrew ‘Pesach’ (Passover) for the day.”
The word “Easter” is used in various forms by all Germanic language speaking peoples: English, Germans, Swedes, etc. The word was adopted because it was used to name a season, not because of the goddess originally connected to that season. Also, there is no known connection or evidence of a connection between that goddess and any Mesopotamian goddess. The nutty theory you posted was put forward by the sciolist Hislop and numerous people have come to believe in it since.