That doesn't bother me. It's not up to me to convince someone, as nothing I can say or do will convince the person. It is the person who will convince themselves, and/or God who will convince them, depending on belief and/or interpretation.
This is something of an unfounded assumption on your part. Assuming you can't convince someone of a position is either indication that you believe you're incapable of justifying your position (or, at the very least, putting a convincing case forward for your position), or that the people who you would otherwise convince are somehow incapable of seeing the validity of your position. In the first case, it's an indication that you're insecure in your own reasoning. In the second, it's an indication that you have a very low opinion of people who don't already agree with you. Neither position seems healthy, to me.
I never start with the assumption that I cannot convince someone of something - that's not a good starting point for any debate or conversation about anything - but I instead start with the position that my opinions have valid reasons behind them, and that the person I am talking to can be made aware of those reasons and is honest, reasonable and intelligent enough to be able to change their mind if they disagree, or else present a convincing argument of their own if they don't.
It's important to note, however, that both of these assumptions are only tentative. I never assume that I am absolutely, authoritatively
right about anything, only that I have
good reasons to believe that I am right. If, in conversation with an individual, I come to realize - through their response - that my reasons are flawed or insufficient, then I change my mind. It does no good whatsoever to assume that anyone who doesn't already agree with you is incapable of being convinced, especially if you feel you have good reasons for believing the things you believe.
This doesn't mean that, even if you have good reasons for something, any remotely reasonable person will automatically agree with you. People aren't always reasonable, of course. But the point is that you shouldn't start with the assumption that nobody can be convinced to agree with you if you have a good case to put forward. I've seen people change their minds about a great many things, and I like to think that I've been able to change minds, just as I am certain that I have had my mind changed in the past purely by a convincing argument.
Suffice to say, many of us have been given reason to believe that is difficult to convey to another.
All I'd like is courteousness, politeness, not being deliberate dicks by insulting or strawmanning, no patting each other on the back, no talking to each other in threads about how silly something is and acting all smug about it. Civilized, polite, and respectful behaviour.
It ain't much, and it's the same as I expect from any theist.
Then why do you only seem to be addressing atheists? In my experience, atheists are certainly no more guilty of these attitudes than theists. Definitely not on these forums.