Considering all athiests are amoral, I am surprised at the many times they call God immoral.
Why do you think atheists are immoral? Since they call god immoral, it would suggest that they do understand what is moral and what is immoral, even to the point that they believe some of the actions that are attributed to god or some of his commandments are immoral. Atheists are more moral than god.
This is an honest question I have had. Where do atheists get their moral compass from? Is it based on society around them? Do the laws of the land dictate what is moral? Can they change their minds if they feel like it? Society used to call many things immoral that are now called moral so is it based on the what others say is right or wrong? Or do they have a "conscience" that tells them what is right and wrong? If so, where does that conscience come from?
The assumption you can only have morals if you are religions is really harsh.
Doesn't this basically translate people (also you!) only act moral because they fear punishment.
So if your god would not threaten you with punishment you would go around murdering, raping, etc.? Certainly not.
Should for the sake of your own argument the assumption not be:
To be a (good) religious person you need strong morals, rather than to have morals you need to be religious?
So where do morals come from? It's called empathy, the capacity to recognize emotions that are being experienced by another being.
And this ability is just hardwired into our brains. Without it our species would not have been able to surfieve in times long before religion. Our empathy / protective instincts even is oversensitive and basically triggered by everything that resembles a human face even the slighted, especially with characteristics of infants (Big eyes compared to the rest of the face), that's why many people like cats and dogs. You see this effect used often to manipulate our feelings, the movie Avatar is a good example.
But well, it basically comes down to this:
A human being is able to imagine the consequences of it's actions for another being, morals are the decision that no being should experience consequences that I deem unpleasant, compared to the actual value of this experience (work for example is unpleasant for many, yet necessary). Also the difference is the case, making someone else a gift, makes us feel good. That's hardwired the same way. I feel good when others feel good because of my actions.
And of course this standards are different for every human, defined by what unpleasant things they deem necessary, I for one am a vegetarian for that reason, which most people evaluate as over extreme.
In the end it comes down to this:
Morals are not obeying a law, whether it is from a government or a religion. Someone that sticks to certain morals just because any other being tells him so is not moral at all, because they just admit they they wouldn't act this way if they where not "being watched"