Infinity is beyond us (being finite persons).
And an infinite God is infinity beyond us.
We most certainly can’t know everything there is to know about God.
Matter of fact, we can’t know much God (there are an infinite number of things about God that we don’t even know we don’t know!).
But we can know something about God…and that makes all the difference.
1 Corinthians 2:10 (NKJV)
But God has revealed them to us through His Spirit. For the Spirit searches all things, yes, the deep things of God.