Well you see, if a deity exists, they would obviously have the power to influence events in order to create an outcome of their choosing.
For example: Imagine that you have a massive tuft of hair in your asshole, and this tuft is so big that it is constantly itching you and reminding you of it's presence. A deity could use this to prevent a nuclear war from occurring.
Ah, you think I'm insane, do you? Well fear not. I shall enlighten you by weaving a series of events that could potentially follow this event, eventually resulting in the end of a nuclear war. (keep in mind that the deity is influencing all these events, thus allowing them to happen and the chain to continue.)
Alright, so first event. You wake up, and after scratching at this rather itchy tuft of hair, you finally decide that enough is enough, and make plans to go to the store and purchase an electric shaver, in order to finally rid yourself of this nuisance. You go through your normal morning routine, and eventually make it to the store (cursing all the way, as the hair itches as you walk.). Upon arriving there, you meet a cute girl who happens to be employed there. Due to a change in the store layout, you are unable to find the location of the shavers, and ask the girl for your help. She directs you to the aisle, where you find the shavers. As you select the appropriate brand, she decides to make some small talk (probably to procrastinate a bit). Picking a topic close at hand (why you need a shaver when you are clean shaven), she strikes up a conversation, but your mind is not focusing on this at the moment, and you unconsciously blurt out the exact reasons as to why you need another shaver. You drop the shaver you were holding, in horror, as you realize what you just said, but luckily, the girl seems to take it as a joke, and laughs loudly. You quickly recover your composure and decide to play along with the idea that you were just joking. Eventually, the girl states that she finds you funny, and offers you her number. Deciding that there are far worse ways to spend an evening, than going on a date with this cute girl, you take it.
Flash forward three years. Your relationship with the girl has grown, and the two of you eventually marry. Being with her seems to give you a massive confidence boost, and you find that when she is near, your public speaking abilities are massively increased. Upon hearing a small speech you prepared for a friend's wedding, she suggests that you should go into politics (your speech making abilities would benefit you greatly there). After several days of mulling it over, you decide to join a political party and are almost immediately successful in your election campaigns. Working your way through the ranks at a meteoric pace, in a few short years you find yourself to be the head of your chosen political party. Your new found speech writing skills seem to have deserted you, however, and you find yourself unable to come up with an idea on what to campaign for in your upcoming election. Grasping at the straws, you decide to bring it back to where it all began, and begin your campaign against the great evil that is asshole hair. Upon beginning your campaign for this, you are shocked to find out that your platform has a massive amount of public support. It appears that the problem of having excess ass hair is far more widespread than you originally thought. You win the next election by a landslide.
Three months into your job as Prime Minister of Canada later, you are alerted by the Chief of Defense, that Russia has began mobilizing it's troops and has aggressively invaded into the northern islands of Nunavut and the North West Territories. You give the order to mobilize the Canadian troops and mount a defense, before contacting the Russian President. In true Canadian style, you ask him his motivations for invading Canada, and of the possibility of making a deal to end the hostilities. To your disbelief, he reveals that the reason he has invaded was not for Canada's resources or their smoking hot women, but because he is of the opinion that razors made in Canada are the most efficient at removing anal hair. It appears that Russia also has the problem of having massive tufts of hair in their poopers. After a moment of stunned silence, you quickly offer a trade agreement that would allow the buying and selling of razors across the border, without imposing any tariffs, as well as lowering the price for your Russian buyers. You believe that slightly decreased profits for razor manufacturers was more than made up for by a potential cease in the hostilities. After all, if the USA (Canada's Ally) got involved, the conflict could quickly turn nuclear. Much to your relief, the Russian President accepts your offer and begins to withdraw his troops. The nation is safe once again, and has gained new found prosperity, as razor manufactures are forced to open more factories in order to keep up with the massive demand of their Russian buyers. This creates more jobs, and economic prosperity for Canada.
So there. I have created a potential scenario where hair in your asshole could lead to you getting married, becoming a successful politician, staving off a nuclear war, and boosting Canada's economy. If I could think of a situation where this could work, I'm sure that a deity could do even better than me.
Therefore: A God does not need miracles, and can use anything for good. Even hair in your asshole.