Theism on Secular Grounds

A reader inquires:

Can one reason from secular premises to a theistic conclusion? Or is any argument that concludes to God's existence non-secular by nature?

The reader liked yesterday's abortion post in which I used non-religious (and in that sense secular) premises to support a conclusion which, though not religious, would be accepted by most religionists and rejected by most secularists.

To answer the reader's question, yes, one can reason from secular premises to a theistic conclusion.  Indeed, the traditional arguments do precisely that.  For example, cosmological arguments proceed a contingentia mundi, from the contingency of the world, and they attempt to show that there must be a necessary being responsible for the world's existence.  That the universe exists and that it exists contingently are secular starting points  -- in one of its meanings saecula just means 'world' -- and not deliverances of revelation or churchly doctrines to be taken on faith. 

Now the same goes for the rest of the theistic arguments, the ontological, the teleological, the moral, and indeed for all of the twenty or so arguments that Plantinga lists.

The reader has a second question.  Can a person sincerely  pray in a secular way?  Suppose a person comes to believe by some combination of the arguments mentioned that there must be a being, external to the universe, on which it depends for its existence and nature.  Suppose the person prays to this God.  Is the person engaged in a secular act?

No. Prayer is a specifically religious act.  The theistic arguments operate on the discursive plane to satisfy a theoretical need.  Indeed they are often denigrated on the ground that the God they prove is a mere 'God of the philosophers' and not 'the God of Abraham, Isaac, and Jacob.'  Even the great Pascal makes this mistake.  See Pascal and Buber on the God of the Philosophers. 

There can't be two or more gods, but there can be two or more ways of approaching one and the same God.  I count four: philosophy (reason), religion (faith), mysticism (intellectual intuition), and morality (conscience).

To sum up.  From secular starting points one can reason to something 'out of this world.'  But to come into relation with this Something requires religious and mystical and moral practices that cannot be called secular.