I think it's fine for muslims to celebrate their milestones in whatever fashion they want. If you rank different communities in the world by religiosity levels, muslims would probably rank the highest, arguably only next to the mormons. A lot of things that muslims do/say might appear "different" to you as a non muslim if you do not understand them as a community or study their culture.
I still remember the day when I first lurked around this forum and saw a post saying "Insha'Allah Pakistan will defeat India!". This was a time when I hadn't interacted with muslims much in my life and didn't know their common usage of words, and so I was taken aback by those words due to the culture gap. I was like "wow, why is he invoking his God for something as trivial as a cricket match, it's really not that deep or serious". It's embarrassing now when I think about those ignorant days of mine but gradually I learnt that muslims use words like "Insha'Allah", "Masha'Allah" on a daily basis in their conversations as God and religion plays a major role in their day to day life, much more than any other community out there.
I know I might be stereotyping muslims here as well and painting everyone as being religious, but in general, muslims are highly pious and religious no matter from what part of the world, unless you're talking about Albanian/Bosnian muslims or one of those central asian states that were part of the erstwhile Soviet republic. And Pakistanis generally rank on the higher side when it comes to religiosity. So they can and should celebrate their milestones in whatever manner they want and it's not our prerogative to stop them from doing so. The only thing is that it might get awkward if the entire team starts doing it as a ritual together after a win if there is someone from a different background playing in the team. Imagine for an example, if the entire Indian team starts doing a hindu ritual (whatever that means) on the field after a win like say the series in Australia, it might get awkward for guys like Siraj or Shami in the team. Or for Samson if he's playing or for the Sikh cricketers in the Indian team. But that's not going to be a problem for the Pakistani cricket team as the religious composition of the team is generally going to be very homogeneous unlike say India or even Bangladesh for that matter. If all of the members in the team are Pakistani muslims and if religion is what that drives them to play better, what is there for others to comment on their celebrations.