There are lots of religions. Lots of "gods".
Some are "offical" - like Judaism, Christianity and Islam.
Some are man-made, not even considered religions. But they are. Things like sports, politics, science, corporations, Etc.
Some talk of a next-life. Some say there's no next-life.
Some promise salvation. Some say there's no such thing.
But only one actually promises a path to salvation - eternity in Heaven -
Which "god" Saves examines those issues.