Another word for Omnipotent is ‘almighty’ which means He is ‘all powerful’. This quote indicates that God must be omnipotent to create the world out of nothing. In the beginning, God made everything from nothing. To look at the universe, at the creation means there must be a creator. Mt 19:26, Lk 1:37, Jer 32:37, Ps 147:5, Job 42:2.

Omnipresent: God is “present everywhere” (CCC 2671)

Omnipresent means ‘all present’ or ‘present everywhere’. God who is transcendent is not removed from creation, but keeps creation in existence and therefore is mindful of every part of creation. (Pr 15:3, Jr 23:24, Ps 137:7-10, Mt 18:20.) Creation would cease to exist if God was not thinking of it. In other words this reality relies upon God for its continued existence. If God was not continuing to will its existence, it would cease to exist. 

"God, who through the Word creates all things (see John 1:3) and keeps them in existence, gives men an enduring witness to Himself in created realities (see Rom. 1:19-20)." (DV 3)