It is not uncommon that when someone is trying to find what works for them, they look at what doesn't work for them as a way to differentiate themselves from others. Neo-atheism for instance defines itself as being rationalistic, therefore in order to take on that robe of rationality, they find fault in the mythic beliefs of religions, poking fun at them, showing how ridiculous and irrational they are. All this is a not-so-subtle way of saying they are more rational than religion, therefore they are on the true path now.
I relate this to what it is like as we grow up, shifting between major stages of development in one's life, such as moving between preteen and teen years. We see ourselves wanting to play with the sorts of toys and interests we did when we were 10, but we realize that a 12 year old is getting too old for that now. So we say, "that's stupid kid stuff", in order begin to emerge into what we are growing into, putting behind the ways of a child.
The problem with this is that if we get stuck there and not realize that being 10 is perfectly fine. If we continue forever saying, "stupid kid stuff", then we haven't actually grown into the teens yet emotionally. We aren't maturing. We are stuck on the past, yet not fully letting it go into our past. It's like identifying yourself as "divorced", rather than single for the rest of your life following a divorce. It's not moving on and getting on with the business of growing up.
Once we begin to integrate a new way of living and seeing life through, once we begin to mature and grown spiritually, emotionally, mentally, and physically, then that becomes the focus. The past falls to the past and becomes part of who we are positively. As my father said wisely to me as I was growing up, "There is nothing we have ever done in our life that is lost and we won't use in some way later".
While we may transcend our past ways of thinking and practicing religion, they are never lost. Eventually, the best of what the past offered is brought forwards, while the parts that didn't work are not carried forwards. If we are fixated on being right and others wrong, we're either still trying to differentiate ourselves in order to find who we want to become, or we are stuck in a bad habit and not facing truly letting go and becoming who we want to become.