There is a real genius and master who spent the whole life in diggin’ deep into that question. His best book is “il silenzio del Buddha”, but the area so many other interesting texts and conferences in you_tube, that may give you a better idea of Raimon Panikkar. He was a Christian open to the infinity. Just to give you an idea, read this link AEJT_2.11_Hall_Multifaith_Dialogue