There are two philosophical problems that spring up immediately with the notion of a 'perfect god'.
1. Since design is flawed, any deity creating it must be flawed as well. For all the talk of 'perfect' creation, from an engineering and biological standpoint, the design of life leaves a lot to be desired. The human body evolved through mutation and selection over a long period of time, and as a result, we are filled with a number of quick fixes to ongoing problems. Take the human eye blind spot, for example. If someone built a camera with such a design, they'd be fired from their job immediately. And we don't have to stop at these. Brain structure, prostate gland, layout of the digestive system, wisdom teeth, the appendix - all poorly designed evolutionary fixes designed to get us to puberty so breeding can commence. Beyond that, nature cares little. So, seeing as how human engineers can propose much better layouts than this so-called 'creator', what does this say of such a deity? He's imperfect. In fact, he'd be rather lazy as well, relying on random chance to repair problems in his design that he was too lethargic to fix from the get-go.
2. Free will is incompatible with omnicience; therefore, either your deity knows your actions before they happen - meaning no free will - or he is not omnicient. For all the talk of God, Allah, and <insert deity here> being all-knowing, there is a lot of talk about humans having free will. 'Free will' means that you as a person can choose to do good or evil whenever you want, or make any morally neutral choice, for that matter. It's all up to you. Unfortunately, free will creates a problem for said deity. If humans can make any random choice that they want to, that means the all-knowing deity doesn't know what choice you are going to make. This means he is not omnicient and all powerful, and therefore, isn't worthy of anyone's worship. However, if you believe that your deity is, in fact, totally omnicient and all powerful, then free will flies out the window. God/Allah/etc. would know what decision you were going to make long before you made it. Decide to go to the bar to watch football rather than mow the lawn? God/Allah/etc. already knows you'll do this because he's omnicient, therefore free will is an illusion. An omnicient, omnipotent deity leads to further problems, too. If Your Worshipfullness is really omnicient, why did he not do away with a lot of the evils before they even started? Why not give Hitler an early heart attack, or throw a lightning bolt at the Spanish Inquisitors? If you are going to use the 'free will' defense, then so much for an all-powerful diety.