"Belief" or "believing in" someone or something is just as the opening post said. Also, "faith/faith-in". And it varies a bit from person to person. Having been on the other side of "belief in God," I get that many will continue to have belief. I might debate on the forum, but I really know that people are on their own journey and I won't browbeat those that don't insist on their beliefs being put upon others.
But as former JW's, we need to understand the passion of those who are sure they are right. I have occasionally not reminded myself of that and I will try harder.
Certainly, belief in some kind of creator is vastly different than the fire-and-brimstone preaching of hard core Christians or Muslims. Most "believers" are closing the gaps on the god-of-the-gaps and accepting what science offers, but just not letting go of an intelligence behind it all. I admire their optimism.