What is the Proof that Allah is our Lord?
Allah is in our intellect. If we think about creation and our own existence we know that there must be a higher power that created us in such perfection. When you look at your hands, your body, the food you eat and how complex it is, then you know that there must be a creator. Everything in the world has a creator. A building has a builder, a machine has an engineer, so the universe cannot come from nothing, it makes no sense.
Now that I know there is a Creator, the Quran itself is full of signs that Allah exists and is the True god. Especially now that many researchers have discovered the things that were written in the Quran more than 1400 years ago. The things that Allah has revealed have to come from the One who created everything. Thus, the Quran itself is a sign that Allah exists and He is our Lord!