[WGfg4CCZ]

First you say we should be uncompromising regarding our faith, then you say we should be unbiased. I cannot see how one can be uncompromising and not biased. I think that if you are uncompromising about the faith you will be unbiased too. Unbiased must mean uncompromising in presenting truth. The only way you would feel that to present the faith without compromise would be 'biased' would be if you considered it no more true than alternative worldviews.
(By the way, Vasilis, while you can find in Islam such things as you mention, you can also find instruction to be peace-loving and caring for neighbour. Such is not so easily found in Hitler's writing: for this and many other reasons I think one should be very careful about seeing any equivalence between National Socialism and Islam.)