I would argue this really depends on their cultural context.
Your question probably implies that the rational background required to be a programmer makes them more rational, and therefore less likely to believe in some religion.
But...
It has been proven that beliefs are not correlated with scientific education. People might have a strong scientific background and yet believe in creationism, don't trust the global warming, ...
There's an excellent article about that, unfortunately in French (but by copying-pasting the scientific studies and looking at the graphs you might be able to get the meaningful parts) It explain why Republicans don't trust in global warming, and the stronger is their scientific background the less they trust it! passeurdesciences.blog.lemonde.fr/2016/12/28/pour…
The key takeaway is that beliefs are bound (it might not be the best English adjective though) to the beliefs of their cultural group. A Human Being don't want to stand out of his own group. So the stronger scientific knowledge he has, the most he'll use it to find some (weird?!) explanation that fit his cultural group beliefs.
So, to come back to your question, my own opinion - but I don't have any data to prove it - is that programmers are more likely to be atheists if they come from - or belong to - an atheist group, and will be more likely to trust in some kind of deity if they come from or belong to such a group.