what does not make sense is to be angry at God when one no longer believes in God. people are free to believe whatever they want, but Christianity is not something that through believing or disbelieving a story, and it is not about praying, fasting and going to church, it is more about a personal attachment with God. you either have that or you do not. many people invest plenty of time in practicing every aspect of Christianity without developing that link for many reasons; and by definition theirs is a meaningless waste of time if they are stuck in the rituals, and many do leave, but in reality what they are leaving is not Christianity and does not even resemble it, and they may feel they have been lied to. Christianity however rarely begins with "they" to be lied to, it rather begins with the self, the conscious being and the curious mind.It makes sense for ex-Christians to attack Christianism
As well as ex-FPM to continously attack FPM (look around the forum)
I think The reason for that is very simple,
Ex-Christians are still more familiar with Christianity than any other religion.
Few of the reasons why they lost faith would be that they feel like they were deceived or maybe even lied to by the Religion they were committed to.
This naturally develops hatred on the long term and it’s real!