Phil's never been an Islamophile. He's actually pretty silent on that issue.
Only sort of. He did make 'Islamic road signs' at one point, posed in a sack that he thought looked like a Palestinian keffiyeh, and bought some maps of the Middle East, sperging out about Iran in particular. On the other hand, he also fantasized about a Palestinian genocide during his Heebaboo phase, and wanted to create an apartheid like system for cishet men in his fake country (which is a great way to insure your country's population never grows, but hey, not my problem).
I think it's more that Phil is afraid of dark skinned people and has trouble with concepts he can't understand; a new religion that's somewhat different from the ones he knows, and moreover, mostly followed by people from different cultures and with different languages than he's familiar with must really scare him. He's very white and suburban at heart. I also think the fact that any mosque would call him out on his trans shit probably scares him too.
But remember when he listed the countries he ostensibly wanted to visit? He left out pretty much all of Africa, the Indian subconinent and SE Asia. Phil THINKS he knows Europe, Australia, New Zealand and Canada because they're ostensibly more or less like the US to him. Even Japan and China he thinks he knows from his weeaboo phase, and of course his stereotypes of Latin America, even if it's all sombreros, queso, cholos and J. Lo in his mind. And of course Russia and Israel from his Slavaboo and wannabe Jew phases. But things like Burundi, Nepal, Sri Lanka, Malawi, Zimbabwe, Nigeria, Yemen, Somalia, Palestine, Iraq, Chad, Cambodia, Laos, Kuwait or Pakistan? He hasn't a clue. He probably couldn't tell you what languages they speak, what they eat, how they dress, what holidays they celebrate, even what their road signs are like. And that's scary to him, partly because it exposes his ignorance.
He really only cares about religion if he can link it to Mexicans.
Eh, he did get into Buddhism during his weeaboo phase, and when pretending to be Communist China, though like most things it was only half-passed at best. I'm sure he was disappointed that most American Buddhists are white and he couldn't find someone to cosplay Naruto with. He also dabbled with 'Wicca' and/or Satanism, which is pretty non-Latino, though he did conflate it with brujería because :autism:.
Of course the most notable one is his short-lived obsession with Judaism, which he again tried tying in with Communism, Slavaboo bullshit and even his fascination with Nazi Germany. The fact that Jews, Russians and Germans haven't played nice with each other never even occurred to him, but then the depth of his knowledge and interest all went back to Hetalia so make of it what you will.
Oddly, he's never seemed to express an interest in Sephardic Jews, despite the connection to Spain, and the fact that many conversos continued to practice Judaism in secret and even immigrated to parts of the Americas. He could easily pretend to have 'rediscovered' lost Sephardic heritage and have the best of being both Latino and Jewish (and even have a connection to Andalusia and the Middle East/North Africa). It's especially weird since he seems to be fascinated by little things like the Beothuk and Kaliningrad. Strikes me he should have heard of the Sephardi Jews. Hell even a lot of opponents of Israel tend to propose a weird dichotomy where the Ashkenazim are European invaders but Sephardim and Mizrahim are peaceful brown natives (never mind that the hardline party Shas is mostly supported by that community and that Rabbi Ovadia Yosef essentially advocated genocide against the non-Jewish Arab minority).
I actually have a pet theory that part of the reason Phil adopted Judaism wasn't just an attempt to stand out and be different, but also because American Jews at least tend to be fairly liberal socially, and he perceived them as being 'cool' with his gay lifestyle at the time. Certainly the stereotype is that Christians in the US are anti-gay, and while many are, especially conservatives obviously, that's still a pretty broad group. Nonetheless, Phil tends to think in very black and white terms. Quite literally in fact. Everyone is either a white cishet conservative Christian living in the suburbs, or a homeless, oppressed non-Christian PoC who's down with the trans issues and living in poverty in the city.
The fact that there are lots of successful black, brown and yellow people living in the suburbs and who don't give a shit about pronouns and gender politics probably would ho over his head. Or he'd just call us traitors and sellouts. I don't know.