Islam is not western. It's a south-west asian religion. Christianity was a west-Asian religion, until it became institutionalized by the greco-roman political elite in europe and christian clergy, so it became a part of western spirituality. West-asian groups that are associated with and part of the islam-genesis begin in the levant and end in afghanistan. If you mean that islam began in the western half of asia, sure, then islam would be western, so would many other religions that would be considered non-western. To me western=europeans. Even if we look past the ideas and cultures associated with islam, there are big theological differences. Christianity is centralized authority-wise, believes in abstract trinity, does not have a sunnah. So it's not that christianity is a western religion, it's a westernized eastern religion, that was adopted by europeans and turned into a european religion.
I could have explained that Islam has the same roots than Judaism and Christianism, and is indeed a offspring of Judeo-Christianism, mixed with Greek and Mesopotamian gnosis and Iranian mystics. In fact, Islam is a remake of these sects of Christian-Jews who did not believe that Jesus was a God, but a prophet and a messiah (many parts of Coran are copycat of gnostic St Thomas's Evangile).
I could have explained that, exactly like Judaism and Christianity, Islam believes that the word was created from nothing by a God, that there is a starting point where time began, and there will be an end of all : Western time is linear ; if you look at Indian cyclic periods (succession of worlds/destructions/worlds) or Chinese cosmogony (no beginning, no end) you could understand why, for Indian or Far Eastern civilization, Islam is Westerner.
I could explain that Jewish philosopher like Maimonid, or Christian philosopher (like Thomas of Aquino), and Muslim philosopher like Ibn Roshd, tried unsuccessfully to conciliate Aristotle and its eternal universe with the revelations of Coran or Bible, because 3 religions were torn between Greek philosophy and Semitic sacred books.
I could have explained why the Christian/Jewish/Muslim ontology concerning the question of Being/Existence/Non Being (In Islam you have Ibn Sîna/Sohrawardi/Mollah Sadra Shirazî for these questions) are absolutely the same way of thinking : the former Greek dichotomy between Being vs non Being, while for a taoist, there is no bipolarity, but a graduation of intermediary states of changing-being 'tao', movement and a non permanent nature.
I could have explained that Judaism, Islam, Christianity have the same God, characterized by anthropomorphism, with the aspects of a sovereign, a judge, a jurist (a psychotic, also) imposing rules concerning trivial questions like food, sex, clothes, etc, all are religions of taboos and rules, for which there are good deeds, bad deeds.For Indian religions, a thing is allowed or forbidden depending on your own dharma/cast/fate. For Chinese confucianism or taoism, and also for the Bhagavad Gita, an act is not bad or good in an absolute way : there are appropriate to the moment or to the situation, or irrelevant.
I could have reminded how, after Judaism and Christianity have been infused by Greek philosophy (Aristotle, Platon and Plotinus), Christianity was influenced by Iranian religions, while manicheism was quite a christian deviance (you do not seem to know that Nestorianism spread in Iran until Central Asia, was called Church of Persian and that many aspects in shiism are catholic copycat cults : cults of martyrs, killed messiah, holy family, Fatma vs Virgin etc). ;
I could have reminded that Syriac church gave to Islam the translation of Greek thinkers and Islam gave to Europe the same inheritance via Jews of Spain, and how Ismaeli thinkers developed a christology around the figure as Jesus the crucified (though Islam does not recognize the crucifixion), with, for example, Sejestani who quoted a Persian gnostic translation of St Matthew, or Nasir od Din Tusî, or Shohrawardî working of St John's writing, and how at the contrary some Avicennian concepts were included in Catholic dogma and theology, until Muhammad Iqbal, for example, who founded his own philosophy and conception of Man Co-Creator with God, by reading Nietzsche, Goethe and Coran.
Judaism, Christianity and Islam are interchangeable : you can translate a muslim thinker, a Jewish rabbi, a Christian theologian, they use the same concepts and same conceptions of the Existence and Essence.
There is no exact translation for Tao, Dharma, Yoga, Yin/Yang, nirvana in Veda, I Ching, Tao tö King, or Buddha's teaching. Because these civilization have not our time, our Being, our Live and Death visions.
I coud have explained all this, but the intellectual level of this forum is too low, it would be like cast pearls before swines (Matthew, 7:6).