I wonder if god willing to a Muslim is god bless to a christian. I hear the latter a lot and other things like thank you lord merged in conversations that are not religious focus if not at all.
I think insha'Allah has a different vibe than God Bless.
Insha'Allah is said almost superstitiously at times as a good luck charm to make it more likely that the thing you want to happen, happens, by saying "If God so wills", since the Qur'an tells a story where people didn't account for God's will or interference and their plans went totally unexpected and things were ruined seeming for them.
So Insha'Allah is often said like "yes, I hope so" as "If God hopes so, please!" even if it doesn't mean that, that is how I see it being used a lot, and so it has taken on that sort of feeling in its frequently being employed like that.
So I might say "then we will go to the bank and get the money, Insha'Allah" meaning "If all goes will, if God doesn't have something else in store". It keeps God/Chaos as a factor for the unexpected and tries to alleviate anxiety about the unknown or un-foreseeable future.
As I said that, a package which caused a lot of stress and ruckus yesterday, arrived just now for the second time, but it not being delivered properly the first time, led me to receive 65 dollars shipping refunded, but then 30 dollars were taken for import fees, and these are the sorts of up and down unexpected transactions, bad things leading to good things, leading to other things which make for a strange sort of balance or fairness or rightness or better-ness that Insha'Allah also refers to, that May God Bring About The Best and Most Beneficial (for me) Solution as God so wills or intends, Hopefully.
I have had opportunities to scam, to steal, to cheat people, but I reject these superstitiously, even though they will work and no one will catch me at it ever and they can even be justified, because I don't want my luck to run out or unfairness through chaotic means to be imposed upon me. It is God who is on my mind, and God in the role of God of Trade (the Greeks might have considered such to be Hermes, HRM being the same root possibly as the word Haram in this interesting linguistic case, representing the borders, or in a sense the limitations which should not be transgressed for one to benefit and also receive grace and fair bonus gifts).
After the Insha'Allah story in the Qur'an, one of the people who experienced the troubles said something like "Maybe God will give us something better/show us a better way" or some improvement and improved understanding, and the irony is, that the destruction leading to their realization of this may also be counted as something more valuable to their spirituality and the rest of their life as compared to the scenario where they succeed in their harvesting and make some money from it but never learn anything or excel spiritually.
Another thing Muslims say a lot (and this one often irritates me) is Alhamdtholillah, pronounced like 'uhl hum though lil ah' (Insha'Allah is pronounced usually like in'sh'uh'lah or insh'uhlah said faster and combined). Alhamdtholillah means something like Praise Be To Allah maybe, but the way that many people use it almost to excess can sometimes be very irritating for me, especially when its used in such a way as to not answer questions or to be clear, and when it is used like that, it is employed as if it means "all is well" or "I'm fine" or "things are good". So, you might for example be saying "How are you?" and a person might respond with only "Alhamdtholillah" or you might say "Are you feeling better now?" and they might respond "Alhamdtholillah" and not really share more than that, it can even imply or mean that they want to leave the matter at that or not discuss details. Some go as far as to say or explain their use as avoiding misspeaking or revealing something that is bad, or would stain a reputation, or be sinful somehow, but maybe its just over-used by some in my opinion, and insha'Allah seems a better thing to me. Hey man, I'm asking for information, not about how God deserves praise!
What else do Muslims say? Ma'sh'Allah, like Mahsh'Uhl'ah. MashAllah means maybe something like "God has so willed it" but it is used as a frequent celebratory praise, and also superstitiously to prevent the "evil eye" which one will find is a frequent superstition in some Muslim communities and cultures, if not most. The Evil Eye is the belief that people's bad intentions can come through jealousy and harm people either magically or through plots against them. Mash'Allah is often employed as a defense towards these things, by reminding oneself that whatever good has happened is because of God only and so "take it up with God if you don't like it, jelly". People often say this when someone reports something good happening to them, or its some celebration or occasion of some sort, and one might even hear it a little more when it has to do with children, since people are more concerned about the evil eye in relation to children or other forms of wealth, such as wealth.
I just got my things! Mash'Allah! Now, there is also an element possibly where it is to prevent something bad happening after the good thing has happened also, and a lot of Muslim thinking comes down to the fear or concern about instability and frequent instability and how to alleviate anxieties through surrender, and it could be said that much of the Qur'an and the whole religion is ultimately revolving around this topic and instilling the fear of such things constantly while also providing the antidote to such through alleviating prayers and philosophy or meditations (as in thoughts about, not not-thinking) on the nature of things and reality and coming to terms with it.
To alleviate anxiety, when something bad happens, or I do something accidentally bad, or see someone else do something horrible, or something is out of my control, like I see that I accidentally or someone else purposefully killed a living bug that is all mangled afterwards and I want to cry, then I say "Rubbay, Aghfir, Wa Arhum, Wa Untha, Khayrur, Rahimeen", and this little prayer/spell is asking God for forgiveness and basically relief, and in my case seems to really work quickly as a remedy to things which are distressing, even if I haven't done them myself, I take the opportunity to ask God for forgiveness, and remind myself that all things are because of God, both ultimately and immediately. This is not typical of Muslims, to say this whole prayer, but instead they might when wanting to be patient, utter a magical name of Allah to make that power come upon them or soothe them, for example, they may invoke the epithet "Al-Sabur" meaning "The Patient" or something, or calm or calming, and so they may say "Ya Sabur, Ya Sabur, Ya Sabur" in order that they receive some of this quality in themselves or the benefits of it. They may also say "astughfiroolah" which might be transliterated more commonly as "astagfirullah" or "astagfirallah" or something, but anyway, that one is used as "Forgive me God", and this is usually done when they feel they have made a mistake or done something wrong, but can also be used in other ways to alleviate distress or anxiety.