Depends on what you mean. Themes, concepts, abstractions, and moral directives? Pretty knowledgeable. But if it comes to minutia, like who begat who, very little. because I don't care haha

I know more about Christianity than most Christians, mainly because it annoys them.

Not knowledgeable or interested in the least. Still an atheist.

Quite well educated in Judaism, Christianity (several sects). Islam, not so much, but enough. Others, I have a general understanding of several and reasonably aware of many other world religions.

The only real difference between religion and myth is that people actually think religion is true.

Religion is manmade down from mankind to control other men through fear

Many attheists started out as believers thus they have knowledge about religion.

[psychologytoday.com]

"Martin Luther said there are no atheists," a man said triumphantly, as if that settled the matter. Through online dating, he had taken me to lunch to try to convert me.

"I don't CARE what a Catholic monk said 500 years ago," I replied, standing up. "Thank you for lunch. I'm leaving."

I have enough knowledge and willpower to shut down Christians trying to convert me. That's good enough for me.

A lot of us are atheists because of our knowledge of religion. I took a test and my results were in that range too.

I think we score so highly because that tested incorporated questions from a wide range of religions. Most theists only have a cursory knowledge of one denomination or sect.

I grew up the son of a very conservative Presbyterian minister. I tried religion, even becoming an elder. I drifted away, and now I am much happier as a non-believer.

I've always been interested in it. One of my favorite classes HS was "Comparative Religions." Didn't have time to pursue this interest in college so I've learned on my own throughout my life. Fascinating how beliefs differ. Similarities are interesting too.

I know a fair bit. I'm willing to bet I know more about the history of christianity and the bible than most christians do.
Which is pretty typical. If christians knew more about the history of their religion and their "holy" book, there would probably be a lot fewer christians.

I have been interested in comparative religion some time, I find it the evolution of religion facinating. I am not an expert, but I try to read as much as I can.

Extensive. Was a born again Christian. As such stidied comparative religions.

Always score significantly above average on every test I take. Christians have the tendency to score the worst out of any group lol.

Religion, what? Religious history, religious doctrine, religious practise, religious diversity..?
Well, I like to think that while I defer to others who are specialists in these various aspects, usually people with Phds after their names and recognised published works, my knowledge is certainly better, in my opinion, than the majority of so-called religious believers, many of whom have never read a serious book about the subject of their so-called 'faith' in their lives. I have been impressed by the high number of similarly well-informed people on this site.

As with most subjects, I admit that I’m more ignorant than knowledgeable.

I was raise in a Ukrainian Orthodox family and went to and graduated from Catholic school. I've done my fair share of bible studies, although I've never read the bible front to back.
I became an atheist as a teenager when I started asking questions and religion in general just stopped making sense.
I understand why religion came to be, and the importance of community that we received from it over the years. It's a powerful tool. However, I do not believe it still has a place in today's society. It would almost seem that the people who still believe are only those who refuse to ask questions.

It was educating myself by reading the Bible that made me an unbeliever at age 11. The inconsistencies, contradictions and acts that defy logic and fact were enough for my childs mind to graps that it was all a bunch of bullshit.

I have not heard it asked here before either. I have studied comparative religion, since before I knew there was such a discipline. Aged 10 or so. It still fascinates, though i do not pursue it so much as before.

It really is an interesting question. My personal knowledge of Christianity is very close to being zero. Living in a Christian Nation , however, has exposed me to a great deal of Christianity and Christians.so I would say I see the type of people Christianity produces. Needless to say I'm not too impressed.

I study them for fun. Eastern ones, mostly.

Someone once said "God IS Dead". I know enough about religion to say that will never be true until we all stop talking about him/her.

My knowledge is on a need to know basis. i.e. ~when religions change I need to know just how long we have to put up with them. Trouble is they are always changing and they were not set up to change.

Enough to know better.