As a planet and a species, we are always evolving. While we might come to find that in comparison to alien races, we are lacking, that in no way removes the fact that we are still developing.
If the truth of the matter is that humans are not the dominate species, that does not mean that we must abandon all that we know to conform with these new ideas.
Countless times have new religions come forth, believers converting from previous faiths, others leaving as science evolves. These religions were all infantile once upon a time, and yet now they are well known, have followers all over the globe.
It might be intimidating at the start to suddenly be around beings with knowledge and faiths far beyond our understanding. This discovery does not have to change human beliefs or religion. For thousands of years, people have not allowed it to change. Not from colonizers and not from war. Extra-terrestrial visitors might challenge peoples faith but they will not destroy it.