As others have said. Religiosity still has the power to shape and effect our society, from blasphemy laws to curtail free speech and shield their faith fom criticism to patrinomy, arranged or forced marriages,guilting thousands over their sexuality to creating artificial divisions between the different sects of believers,ethnic cleansing, suicide bombers and mass murder.
No surprise then that secularists have plenty to say about some of the more absurd or unpleasant actions of the faithful.
The attitude you say you employ, in your OP ("Me, if I dont believe in something... etcetc) is analogous to the ostrich sticking their head in the sand.
All ideas should be subject to criticism, most especially those insidious ideas, based largely around belief in the absence of evidence, which encourage and endorse irrational , dangerous or downright murderous behaviour.