in the shadows
"What is wrong with religious and biblical arguments taking place in Philosophy? "
They become tedious, redundant and exclusionary (and often monumentally boring) but the question itself illustrates a part of the problem; the arguments rarely are broadly referenced religious and/or biblical arguments - they most often take the form of narrow didactic christian pedantries.
"In no way must you participate in any such lines of discussion if you don't wish to. "
No kidding; I wonder if that is why my time spent in discussion forums has dwindled from first encounter to almost nothing?
"But the reason that such religious discussions come about is because they are inevitabley part of almost any very important philosophical topic you may bring."
This statement clearly is based on hubris, is incorrect, and warrants little response.
"Trying to remove Religion from Philosophy is like trying to remove a colour of the rainbow from the rainbow. It is likely impossible, but even if it were possible it shall only make the rainbow less colourful."
You are clutching a handful of similarly sized and colored pebbles from a broad beach strewn with pebbles of every imaginable size, color and shade. You waive them in everyone's face insisting that they are the answer to everyone's questions or needs, that they must be recognized as the most important pebbles for everyone, and yet they are insignificant when compared to the diversity of other shapes, colors and shades available on the beach.
I offer only a different metaphor, the observation that there is much more to the elephant than the blind man could tell by touch.