In the OTL,most of the Indo-European religions have been replaced by Semitic religions originating from the Near East. Almost all the descendants except Hindus had been converted to Abrahamic religions or Semitic religions originating from Judaism. In this timeline,you should have the Indo-European Religions replace the Semitic religions by converting the Semitic peoples(Jews,Christians,Muslims,Arameans,Sabeans) to any Indo-European Religion. If you include Hinduism or Zoroastrianism,it should be a Universalizing version of Hinduism or Zoroastrianism and not OTL version. If you want to include Buddhism,it should have a lots and lots of European Pagan influence. Only Universal religions and no Ethnic religions allowed. Big bonus if the religions originate from Europe. Go ahead.