I often find myself in debate being told that one person's opinion on a particular matter is not subject to criticism because it comes from their faith.
I'm unimpressed by this argument. If your god tells you to behave a certain way in return for the usual rewards that gods offer their worshippers for whatever tributes these modern gods are into nowadays, you go right ahead. I suspect that you'll be disappointed when the time comes and said gods do not come through on their rather lavish promises, but that's just my opinion. There remains a vanishingly small probability that one or more of the many gods from history is doing right by his/her flock but that's rather beside the point.
An opinion derived from reading an X thousand year old book, or more likely a subjective interpretation of it, is far less likely to contain great wisdom than the calm considered judgement of educated people after open debate and dispassionate consideration. I will state my opinions on whatever I see fit and if anybody's god doesn't like it I don't see why he/she can't express it directly via thunderbolts or whatever the modern equivalent is.