God is not omnipotent - If God can't create another being that has the power to kill him, then that too means that God is not omnipotent.

You made God human - which is the only way most people can relate to the subject. If god is just an energy force with intelligence (for example) he can not be killed. Since you placed god in our reality subject to our conditions you created a false result. Try again.

God is not omnipresent - If God is omnipresent, then God exists in pure evil at all times.

If god is the fabric of all that is created then yes this would be true. But, once again, if we do equate God to the fabric of this creation than that does not impute the variables of our reality upon God. To explain this to you in simple terms, your computer is made up of atoms, but the atoms do not take on the properties of the computer - they exist independently of the computer and it's functionality. In other words, God does not loose identity simply because he embodies everything. And who the fuck exactly is this devil you're talking about?

God is not omniscient...since you are not in control of your choices and destiny and [because] God knows everything, therefore if he knows everything, he can't create any new idea or concept or piece of knowledge.

You totally miss the concept of free will. We control our choices. And again you are placing God in to this reality - works good for your small brain but if he's outside this reality than God could know everything about our relaity (for example not subject to our perception of time) and still have created us and this reality.