Complex sentence: Eldem has been criticized by being "extremely" anti-Christian, anti-West and anti-Usa mainly because he seems that he is attacking Christianity and Judaism in his book about Marduk while he is not writing anything about Islam.
Split into simpler sentences: Eldem has been criticized by being "extremely" anti-Christian, anti-West and anti-Usa. Although he seems that he is attacking Christianity and Judaism in his book about Marduk, he is not writing anything about Islam.