'with all due respect' (as we say at work -lol!) I think you fail to see what we are saying. The word 'wrong' sounds tough, but this is a fair word to use in this situation. If one person believes that ALL religious belief is 'wrong' (silly, unfounded, unnecessary, built on dodgy foundations, unsubstantiated, dangerous, superstitious etc), then ipso facto (or some such latin phrase) their belief in religious icons and religous / sacred spaces that they use for their religous beliefs is immediately and 100% wrong to you.

It doesn't make them a bad person, and it doesn't make their opinion less valid than yours (and it doesn't make it right to discriminate against them for their views) but it does make their views technically wrong to you.