That's not what this says.That grace and peace must be multiplied to us BEFORE we can have access to the fulness of God.
2 Peter 1:2-4 KJV
2) Grace and peace be multiplied unto you through the knowledge of God, and of Jesus our Lord,
3) According as his divine power hath given unto us all things that pertain unto life and godliness, through the knowledge of him that hath called us to glory and virtue:
4) Whereby are given unto us exceeding great and precious promises: that by these ye might be partakers of the divine nature, having escaped the corruption that is in the world through lust.
His divine power has given unto us all things that pertain unto life and godliness.
But if you don't believe this is true, that's not faith, and we access these in faith, not unbelief.
Much love!