Mars has in fact produced something. The first unmanned craft landing on MArs had seperate tests for microbial life in the martian soil. The first gave a positive result which was determined as inconclusive. In other words it may have found life or it may have found an unusual chemical reaction. The second test found nothing and gave a negative result. It was only years later that they discovered the equipment used for the second test often fails to find life here on Earth where we know it exists. In fact the failure rate is 50% or more, this of course makes the testing on Mars with this specific method very unreliable.
As a result of this many experts in the field are pushing for funding for better tests to be used on Mars in the future. Basically Mars is back in the unknown category we can neither confirm it nor rule it out. We also need to look harder at Jupiter and Europa. Jupiter, Europa and Mars look more and more as though they COULD support life as time goes by and learn more about them. They are also tantalizingly close enough to reach.
I have no idea why you tie religion into this. Finding life on other worlds does not constitute proof that there is no god. In fact one can find no such proof anywhere in the known universe because one cannot prove a negative. SETI has nothing to do with God or religion one way or the other.
Anyone wondering what I'm talking about start here:
The Psychology of Persuasion