Original sentence: An agnostic of Islamic background may refer to him/herself as a cultural Muslim, but this is likewise unacceptable to most observant Muslims.Many Sunni regard the Shia and the Allawi sects as non-Muslim.The Ahmedi sect consider themselves Muslim; however, most Sunni and Shi'a Muslims disagree
Edited sentence: Likewise, there is a disagreement whether communities like the Shia and the Allawis are to be classified as Muslims.The Ahmedi sect consider themselves Muslim, and an agnostic of Islamic background may refer to themselves as a cultural Muslim; however, most mainstream Muslims disagree with both these classifications, since they deviate from several main beliefs of Islam