Does GOD tell us in the bible he is almighty/omnipotent/omniscient, or are these attributes (greek?) philosophers and theologians merely ascribed to HIM?
A simple Bible search for 'almighty' would have given you more than enough passages about omnipotence. The first mention, for example, is:
For omniscience, similarly many, many passages exist -- the combination of them shows quite strongly that God is omniscient. For example:
He is definitely almighty. There are many psalms that praise his power, and say that there is no one like God. Revelations states:
God, is definitely all-knowing. He knows the hearts and intents of men. He knows what they are going to do. In Matthew, it shows that Jesus is able to discern the thoughts of people:
Others can provide a more comprehensive list of Scripture, but time and time again in the Bible, it has been made quite clear that God is supreme and divine, knowing all, having power over all, and is everywhere. He is infinite.