Neil Gillman.  Sacred Fragments: Recovering Theology for the Modern Jew.  Jewish Publication Society, 1990.
Neil Gillman teaches theology at Jewish Theological Seminary in New 
York City.  I audited a class of his when I was a student there.  His 
book, Sacred Fragments, overlaps a lot with what he discussed 
in that class: Gillman said that believers and unbelievers can look at 
the same reality and arrive at different (even legitimate) conclusions, 
and he talked about such thinkers as Mordechai Kaplan (who saw God as an
 impersonal force moving the world to a state of wholeness), Franz 
Rosenzweig (who emphasized personal experience of the divine), and 
Kabbalah (which posited that God’s Shekinah was exiled from God and that
 God could be repaired through observance of the commandments).  The 
book still has territory that was not covered in class, however.  For 
example, in the class, Professor Gillman told us that we should consult 
his book, Sacred Fragments, for his discussion about the 
classic arguments for the existence of God (i.e., the ontological 
argument, the cosmological argument that everything has a cause and thus
 the universe had a cause, and the argument that the cosmos manifests 
design).  He did not want to explore them in class because that was not a
 topic that particularly interested him.  The book also provided me with
 background information about philosophical topics, such as 
existentialism, and it covered the thoughts of Jewish thinkers whom 
Gillman did not talk about in the class, as far as I can remember (i.e.,
 Buber, etc.).
Judaism has wrestled with many of the same issues that Christians 
have in the field of religion.  Is the Bible God’s revelation, when it 
arguably contains signs of being the product of human authors with their
 own ideologies and agendas?  Is the Bible authoritative, containing 
God’s commands?  Is there even a God, and, if so, how can we know?  If 
there is a good God, why is there suffering?  Is ritual consistent with a
 living, vibrant experience of God, or does it hinder that?  Judaism 
would relate some of these questions to other areas than Christians 
would: for example, Judaism would look at the Torah and its laws 
specifically.  Still, the questions are similar, and so Gillman’s class 
and book resonated with me, even though my religion is not Judaism.
Where exactly does Gillman land on these questions?  My impression is
 that he is usually presenting options rather than telling people what 
to think and to do.  Here are some things that Jewish thinkers have 
thought, and it is up to you to make up your own mind (along with your 
community).  You may feel that ritual hinders a lively experience of 
God, but perhaps it can create opportunities for such an experience to 
occur—-it’s something to think about.  You have to decide for yourself 
if you want to see life as a believer in God or as a non-believer.  You 
are the one who can determine whether or not you feel commanded by God 
to do something.  The classic rational arguments for God’s existence may
 not prove God’s existence, but perhaps you can still find in them a 
justification for belief, plus rationality is good because it can sift 
out the absurd.  Gillman’s approach looks like subjectivism and 
experientialism, but Gillman appears to be open to the possibility that 
there is a God in the world, that Israel experienced something on Mount Sinai, and that people now can experience the divine.
I’m the sort of person who looks for something authoritative, for 
solid ground to stand on.  The thing is, being an adult usually entails 
the sort of process that Gillman displays: looking at options, deciding 
what makes sense to me, and making a choice.
There is more that I can say: what I thought about Gillman’s approach
 to the arguments for the existence of God, the existentialist who 
posited a scenario in which Elijah asked God to send fire from heaven to
 undercut the prophets of Baal and God did not send the fire, etc.  But I’ll stop here.