I have found that most vociferous and hostile Atheists will not use a capital ‘G’ when writing the word “God”. I know, I know, it’s not necessarily a name, per se. However, when debating with Christians, it is for all intents and purposes, a name.
I’m not convinced this is an attempt to be grammatically precise. No, I believe it’s done in protest. There is an emotional rejection to God that isn’t admitted. It reveals a deep emotional aversion to God. Much like the belligerent and disrespectful teenager who calls his parents by their first names rather than the appropriate mom and dad.
On a tangent, personally, I detest President Barack Obama. I think he is a smug, arrogant amateur who is in way over his head. He is little more than a social justice activist who was able to convince enough people that he is none of these. However, I am always sure to properly capitalize his name, and title whether his title, President, grammatically warrants it.