It is a worthy question to ask.
God is so good to us, in spite of all our sins, our failures, and this fallen world:
"But God commendeth his love toward us, in that, while we were yet sinners, Christ died for us." (Romans 5: 8)
His love is present-tense, even when we were not present to receive His love.
Really, though, what can we give our Loving Father?
David the great king admitted that we can't give anything of ourselves:
"But who am I, and what is my people, that we should be able to offer so willingly after this sort? for all things come of thee, and of thine own have we given thee." (1 Chronicles 29: 14)
The moment we think that we can offer God anything, let us simply remember--with joy and gratitude--that anything we have, He already has given to us!