But, this opens the door to asking, "Why don't atheists pray?" If God could be real according to you, then why not pray?
For the same reason I still don't write letters to Santa Claus. I can't rule out the existence of Santa Claus with 100% certainty. I could probably be 99.999999999% certain, but I'll probably never be 100% certain.
So if I use your logic, why not write letters to Santa Claus?
Why not look for Easter Bunny eggs?
Why not put any teeth that come out of your mouth under your pillow at night?
Why not check under your bed before you go to sleep just to make sure there are no monsters under there?
Why not check in your closet to make sure the Bogeyman isn't in there?
If you spill some salt, why not throw a pinch of salt over your left shoulder just in case?
Why not knock on wood to avoid tempting fate?
Why not avoid stepping on cracks in order to not break your mother's back?
Why not go out of your way to avoid having a black cat cross your path?
Why would you ever tempt Bloody Mary by standing in front of a mirror with running water, the lights off and say Bloody Mary three times?
Why not pray to other gods?
The last question is interesting. I assume the response will be, well the ten commandments says something about not having any other gods before YHWH. Why not I wonder. Do those other gods exist or not? If they do and YHWH isn't answering prayers in a timely fashion, why not see if some other god is available? Who knows, maybe YHWH contracts prayer answring to other gods now and didn't let us know.
If you refuse to pray, then you are admitting that you believe there is no God.
Who refuses to pray? I guess some atheists may say they refuse to pray.
Seems silly to me to refuse to pray. From my point of view, prayer is at best a type of meditation or relaxing exercise and at worst completely meaningless and a waste of time.
It also depends on what you mean by prayer. There are times when people say bow your heads for a moment of silence (for someone who is sick or died). Is having a moment of silence out of respect considered prayer? I don't think so, I think about the hardship or sacrifice that the person went through or is going through.
One of my coworkers has a son who has serious medical problems and when we discuss how his son is doing I will sometimes comfort him by letting him know that his son is in my thoughts. It is true, his son is in my thoughts and I hope his son gets better and wish I could do more to help but I can't, I'm not a doctor. Is that considered praying? I'm not praying to a god when I do this, instead I am just concerned about a fellow human being.
What I do now compared to what I did when I was a Christian is very different. I didn't pray much when I was a Christian but when I did, most of the time it was to ask for wisdom, guidance or help for others. Prayers for wisdom or guidance seemed to often work but help for others was fairly inconclusive. Comparing results of the few instances that when I did pray with the times that I did not revealed that to me that it didn't matter if I prayed or not.
I don't refuse to pray. I simply have no use for asking for something from something else I do not believe exists.
The same is true for Santa Claus. I do not believe Santa Claus exists, so I do not write letters to Santa.