I do not mean to suggest that these theories are not defensible, nor am I arguing that they are "untrue"; I am merely hoping to highlight the current similarities between belief in such theories, and religious belief. As I stated earlier, this is an area of fierce and fascinating discussion right now. (I say "current similarities" because the elision between the two may disappear as soon as we achieve a Grand Theory)
Is not the point of the Large Hadron Detector to detect previously unknown particles which are the cause of the fundamental forces?
Currently we cannot see or observe any sub-atomic particle, we can only deduce its existence by theory, and by the effects any such particles have upon other known particles. We cannot even observe the effects of sub-atomic particles in the macro world (although we may be n the threshold of achieving this). It is hoped that the LHD will enable us to see and observe the effects of sub-atomic particles, specifically the Higgs-boson, which so far is only theorised. However, "seeing" such quanta is really a matter of theorising the effect it will have, and then looking for the effect; we do not see the actual particle.
This is my understanding; I'm happy to be corrected about this
Don't gluons mediate e.g. the strong nuclear force, gravitons (undetected to date) mediate gravity and so on? The LHC should hopefully detect the Higgs boson too.
Indeed... But such particles (if they exist in the form in which we suppose... or exist at all....

) are still just
mediating the forces. What are the forces themselves?
String theory's on the downturn now that it's having to appeal to the anthropic principle to retain its plausibility. A shame, but it's become unconvincing.
Yep.
Attention has now turned towards Dark Matter: yet another theory that cannot be seen, has not been proven, and is a matter of faith based on reasonable deduction.
The argument about the similarity between physics and religion is based on this same premise.
Just to clarify, I'm not saying that physics is a religion, nor that religion is a science; I am saying isnt it interesting to see the similarities between the two?