I cannot think that we are useless or God would not have created us. There is one God looking down on us all. We are all the children of one God. The sun, the darkness, the winds are all listening to what we have to say.
God the Father and God the Son cannot be everywhere present; indeed they cannot be even in two places at the same instant: but God the Holy Spirit is omnipresent - it extends through all space, with all other matter.