This isn't true.. well it is true that they had a common ancestor, but that common ancestor had more to do with the aboriginal people of ancient India and the founders of ancient greece who were African.
Regardless,
http://www.sciencemag.org/content/332/6027/346.abstract
and
http://onlinelibrary.wiley.com/doi/...ionid=327B3D37AE8CBD7D6200A7F7C3BA5D71.d01t04
Greeks are found to have a substantial relatedness to sub-Saharan (Ethiopian) people, which separate them from other Mediterranean groups. Both Greeks and Ethiopians share quasi-specific DRB1 alleles, such as *0305, *0307, *0411, *0413, *0416, *0417, *0420, *1110, *1112, *1304 and *1310. Genetic distances are closer between Greeks and Ethiopian/sub-Saharan groups than to any other Mediterranean group and finally Greeks cluster with Ethiopians/sub-Saharans in both neighbour joining dendrograms and correspondence analyses. The time period when these relationships might have occurred was ancient but uncertain and might be related to the displacement of Egyptian-Ethiopian people living in pharaonic Egypt.
Not to mention, you can take any part of the religion and trace it back.. but the trace isn't a loose trace due to similarities.... its a direct link to migrations and cultural influences. We can pretend like enlightenment philosophies and animal scarifies, sun gods, etc have nothing to do with the african roots of all that..... but it's interesting to me that you can take any random part of the religious culture and directly trace it back.. like the Spinx all over India (that are still a part of the culture) and other parts of Asia.. or the spinx that was important to greek mythology... that concept was created and transferred from Africa.. especially the greek one.
There is a reason why you would even bring up indo europen culture- here is is
http://en.wikipedia.org/wiki/Black_Athena#The_ideologies_of_classical_scholarship
"Bernal emphasizes African elements in Ancient Near Eastern culture and denounces the alleged Eurocentrism of 19th and 20th century research, including the very slogan "Ex Oriente Lux" of Orientalists which, according to Bernal, betrays "the Western appropriation of ancient Near Eastern culture for the sake of its own development"