Hey, ratikala...I'd describe myself as an atheist, but not an anti-theist. Still, thought I'd throw in my views.
I have no issues at all with theism in and of itself. I have plenty of theist friends, and the majority of my closest friends are practising Christians, I guess. My family are majority non-practising Christians.
I think where issues would come from is more around secularism. I want my kids school to be religion free. They sing Christmas carols, etc, and I'm not a hard-arse about it (hence not anti-theist) but the way I see it, no-one actually wants religion as part of the school, with the possible exception of some who like their OWN religion to be part of the school. As an ex-educator, I worked at a school that included religious education (which was a stupid term...it was Christian literalism) and went to a primary school which did the same. That's not appropriate, to my mind.
Similarly, I don't want religion involved in politics. I'm neither naive to assume, nor militant enough to try and force people to not consider issues through the teachings and messages from their religions, but I don't think it's appropriate, for example, for a politician to use Jesus as an argument when discussing immigration policy.
(Of course, that politician is now our Prime Minister...smh...)
So, mostly my arguments in RL would be against Christianity, but these are few and far between.
I did get upset, for example, when Christian groups tried to prevent football being played on Good Friday. They have no issue with football being played on a Saturday since that effects other religions and not their own. I'd prefer people thought a little outside their own box, and worldview.
Mostly, my Christian friends and I live and let live, and religion is almost never an issue. We do tend to avoid serious discussion on it, though, since our views are not reconcilable. However, when one of my friends had a few issues, and was thinking about attending church, I actually encouraged her to, as it seemed the best path for her at the time. Confused her no end few months later when she wanted me to come, and when I refused and she asked why, I told her in very simple terms..lol
So, yeah...Christianity and to a lesser extent Islam are the religions which have practical impact on my life and world in an unavoidable way. So it's Christianity, and to a lesser extent Islam, which I tend to argue against in certain circumstances.
I'll leave it there, but happy to give my view on anything.