Many atheists claim that God does not exist and as such they choose to not know who God really is. In their ignoring reality, making claims such as the universe created itself out of nothing; atheists try to make themselves feel better by making up gods to which they know do not exist while ignoring the one real and true God of the Holy Bible who has revealed Himself through the order and design of all of nature and universe.
To know who God is, we need to understand the attributes of God to get an understanding of who God is. Below are the known attributes of God.
SELF-EXISTENT: God has no cause; He does not depend on anything for his continued existence.
TRANSCENDENT: God is entirely distinct from the universe, as the carpenter is distinct from the bench; excluding pantheism (God in all) and animism (everything is a god).
IMMANENT: Though transcendent, God is present with and in the world; excluding deism (God is out there but not here).
IMMUTABLE: God is perfect in that He never changes nor can He change with respect to His being, attributes, purpose, or promises; excluding process theology, Mormon doctrine of eternal progression.
ETERNAL: God is perfect in that He transcends all time and temporal limitations, and is thus infinite with respect to time.
OMNIPRESENT: God is perfect in that He transcends all space and spatial limitations, and is thus infinite with respect to space, with His whole Being filling every part of the universe and being present everywhere (not diffused through the universe, but present at each point in His fullness).
OMNIPOTENT: God is perfect in that He can do all things consistent with the perfection of His being. God cannot do the self-contradictory (e.g., make a rock He cannot lift), nor can He do that which is contrary to His perfect nature (e.g., He cannot change, He cannot lie, etc.).
OMNISCIENT: God is perfect in that He knows all things, including events before they happen.
INCORPOREAL: God has no body or parts, and is immaterial, being a simple and infinite being of spirit; excluding the Mormon doctrine of God as an exalted man.
ONE: God is a perfectly unique and simple being, existing as one infinite Being called God. There is therefore only one God, who is called Yahweh in the Old Testament, and who reveals Himself in the persons of the Father, Son and Holy Spirit in the New Testament; thus excluding polytheism, tritheism (belief in three gods), and subordinationism (in which Christ is a lesser god subordinate to the Almighty God).
CREATOR: God is the One through whom all things have come into existence; by His unbounded power and knowledge He created finite existence ex nihilo and formed the universe as it now is.
PERSONAL: God, as the author of personhood in the created universe, cannot be less than personal Himself; thus He experiences relationships with other persons, or self-conscious beings. Note that God may be more than personal, indeed, His infinite nature suggests that He must be.
INCOMPREHENSIBLE: God is incomprehensible, not in the sense that the concept of God is unintelligible, but in the sense that God cannot be fully and directly known by finite creatures, because of His uniqueness and His infinitude.
MORALLY PERFECT: The following are the moral attributes of God; they are listed here together because God's moral nature is perfectly unified, with no tension between His wrath and His love, for example.
a. GOOD: God is morally excellent, and does only good
b. HOLY: God is morally transcendent, utterly separated from all evil, and perfectly pure
c. RIGHTEOUS: God is perfectly moral in all that He does, doing everything right
d. TRUE: God is perfectly truthful, and cannot lie
e. LOVING: God's moral character is pure love, sacrificial giving for the true benefit of another
f. WRATHFUL: God's moral perfection requires Him to show displeasure against anything which seeks to act contrary to its moral purpose, to judge that which rebels against His authority as Creator and Lord
To say that “God is omnipotent” means that His power is limitless, and, thus, God is capable of doing anything that is logically possible. This does not mean that God can do things that are absurd or irrational. It is absurd and irrational to think that God could create Himself because as we see from God’s attributes, God is not created.
In fact, the Bible is very clear that there are certain things God cannot do: He cannot lie (Titus 1:2) and He cannot deny Himself (2 Timothy 2:13). This is not because He lacks the power, but because He is true to His own nature. So, there is no contradiction in saying that God is all powerful (He can do anything that is logically possible), and yet He cannot do things that are logically impossible.
In fact, apart from the biblical God, we would have no reason to believe that contradictions are always wrong because the law of non-contradiction itself stems from the nature of God. All truth is in God (John 14:6; Colossians 2:3), and God cannot deny Himself (2 Timothy 2:13). Thus, truth will not go against itself; it will not contradict. Apart from the biblical God, there would be no reason for the law of non-contradiction—or any law of logic.
Now you know the attributes of God as described in the Holy Bible and revealed through the order and design of all of nature and universe.
Main Resource: http://www.equip.org/articles/the-attributes-of-god