As a philsophical outlook, yes conservatives tend to urge others to help each other by voluntary means. However, that is not to say that in reality liberals are any less likely to help voluntarily. There are a lot of hypocrits in the ranks of both liberals and conservatives.
For my own part, I will freely admit I am unlikely to be quick to help anyone other than friends and family. I'm not down at the soup line dishing it up for the homeless. Therefore I can't be calling on anyone to do that. But if they like to do that, more power to them.
But liberals often have an unfounded and misplaced faith in the government to solve societal problems. All too frequently, such government interventions fail disastrously. And then further, when they have clearly failed, liberals tend not to be able to admit such, and to clean up the mess they've created.
But which makes for a better society? That in which one is implored and pushed (by society and by God) to do good works for others (including strangers), or one in which we send off a check to the government bureaucracy to do good works for us, and then sit back and wash our hands clean? As an atheist, you have no powerful presence in your life (that you discern, anyway) pushing you to give of yourself to others. I do not have that luxury.