God is unexplainable, but that’s no great surprise. Lots of things in the world around us are unexplainable. Light - with which you are reading this - exists as a continuous wave and as a steam of particles at the same time, and science cannot explain how. So, for God to be the creator of the universe, and Jesus, and the spirit living within us is no more unexplainable than lots of other features of the world around us.
We experience God in a variety of different ways, and many of those experiences are unexplainable. We needn’t panic if we cant explain it. The important thing is that we are open to God as he informs us, challenges us, inspires us, comforts us, corrects us, inspires us…. the list could go on for ever!