I would say 'yes'. But not out of an atheistic or agnostic belief. Stating the pro-belief does not weaken the concept of an almighty 'God', but may enhance it. The fact that other races of intelligent beings may have come before humanity may only strengthen this case. Here's how...A more advanced race of humanoids, say possibly eons ahead of humanity, could have arrived on a much younger Earth, with very primitive, proto-humans, such as 'Neanderthals'.
These extraterrestrials probably studied their genetics and found out that the neanderthal-humans, and their life-patterns were not suited for long-term survival on Earth. Perhaps these beings tried to tinker with their DNA, to improve their plight, but found it was impossible. Maybe these beings saw an opportunity to create a new hybrid-species of humanity, maybe as a 'worker-species' in the beginning, as some ancient Sumerian texts clearly stipulate that the 'lulu', or humanity was created for. They may have infused some of their compatible-DNA with some of the primitive-DNA at the time, creating the first more advanced humans.
To juxtapose this conversation with the concept of an all-mighty, spiritual 'God', this could have been following the capitalized 'God's will', with the lower-cased 'gods' basically just spreading what we call humanity in the form of an 'alien-human' hybrid that survives to this day. Perhaps these more advanced humanoid beings were creations of God, with souls. The infusion of this more evolved and possibly more spiritual DNA created a new branch of humanity with a soul, on the Earth, capable of adapting and surviving as a species on the Earth, whereas the Neanderthals died out.
This does not weaken the cause of a spiritual God, it only enhances it. Perhaps these humanoids coming from a different world in effect did God's will by creating another branch of humanity that could and did survive, in effect passing 'God's-essence'. The Old Testament and the ancient Sumerian texts are stunningly parallel, starting with the creation of mankind right through the Bibical flood, i.e. "The Epic of Gilgamesh" from the ancient Sumerian texts, which amazingly parallels the Bibical flood almost event per event.
Even the Vatican has come close to accepting the reality of extraterrestrial beings, believing that they are here and may have played a significant role in humanity's development into a more advanced human being does not weaken my faith in God one bit. After all, the Holy Bible is just one of many historical documents that amazingly parallel each other when it comes to Bibically-documented events. The Old Testament alludes to a race of super-beings known as the 'Nefilim' and saying about the creation of humanity: "Let us make man in our image, after our likeness." The pluralism part was never quite explained away convincingly enough. Extra-apocryphal books of the Old Testament, such as "The Lost Books of Enoch" all allude to advanced beings coming down from the stars and giving humanity knowledge in sciences, before the Great Deluge arrived.
The Old Testament is indeed taken from the ancient Sumerian texts-from the creation of humanity to the great flood. The creation of humanity, or the Lulu, is just briefly mentioned to in Genesis, compared to the lengthy creation epics in ancient Sumerian literature. Evidence that there is far more to the Holy Bible comes from the rapid growth of humanity from the times of Adam and Eve. The Bible is woefully inadequate in its detailing of human history, and can be completed through the Sumerian records, which give a complete account of these advanced humanoid beings creating a hybrid species of humanity with the infusion of their superior, 'God-genes' into the DNA of the primitive humans of the time. Perhaps we are still monitored to this day by these extraterrestrials through alleged, long term monitoring of humans...