OK, I'll bite. There are a few inconsistencies:

[All] athiests are much more open-minded than any religious person.

Open-mindedness is a big term and, in your context in the follow-up post, now want to constrict it to a question of belief in a higher power. However, this was not the context in your original post. Define this term. I could see lack of faith as being a component of being open-minded. However, there are other facets. For example, right now on r/atheism there is a post top-voted poking fun at rapists. Yes, it is humor (and is very parallel to the image in this post, which I disagree with), but it seems to be close-minded to me. Also, there are often posts that poke fun at cultural (see: not necessarily religious) dress. Additionally, open-mindedness takes into account the feelings of others. If you can support, as you state, that athiests surpass "[ALL] religious [persons]", I will concede. I choose to believe that open-mindedness is being "receptive to the new and different ideas or the opinions of others" (American Heritage Dictionary). I think that many posts in r/athiesm shows a remarkable lack of receptiveness to the ideas and opinions of religious people. Evidence is one way of looking at the world, religion is another. I myself am atheist and choose reason and logic. I am in medical school and choose western medicine. However, I understand that not everyone believes this and that is ok. It is my job to give information on my side of the issue (and sometimes even advise) but, at the end of the day, it is their body, their mind, their choice. Side note: if you have not read "The Spirit Catches You and You Fall Down", I would highly recommend it. It really opened my eyes to respect other cultures and belief systems.

However, you have an uphill battle.

That would be the definition of retarded.

To me, that speaks of close-mindedness and bigotry. The definition of mental retardation is believing all viewpoints? Rather, you come off a bigoted, pretentious, and lacking in empathy. I'm not saying that a religious person would act differently but, based on the context in your post, the onus is on you to prove (with evidence) that atheists are more open-minded that ANY religious person.