Now someone's gone and made a claim.  The onus of proof is upon you for both prayers being objectively good and pornography being objectively evil.  Perhaps the words 'good' and 'evil' have a special meaning in the christian faith which makes these statements provable but then you suffer from a self-reference which renders your point moot.

If there is no objective truth about the value of prayers or pornography then I think that subjective offensiveness is very much worth considering.

If you are trying to open my mind to the idea that logic itself is not absolute then I'm afraid I'm a lost cause.  My belief in logic is probably as strong as your belief in christianity.  If you reply to this with a solid logical argument then I'd love to continue this discussion but otherwise I think we'll simply have to go our separate ways.  Please know at least that you've not offended me.