The only planet in our solar system capable of supporting life , as we know it , is the Earth . Therefore if ( and it's a big "if" ) there were aliens out there they would have had to come from another "solar system" . This means that contact between us and them would be almost impossible . The closest star is 4.5 light years away and I don't know if that has life-supporting planets . The fastest we can send messages at is the speed of light and as for physical travel , we can't get anywhere near that speed .
Supposing there was a planet , say 50 light years away , and we managed to find a common communication medium , and I sent a message , say , " God made us in his image..." - and 100 yrs later I got the reply - " No Ben , you've got it all wrong , God made US in his image....".....
Basically if (...big if ...) God had created another life form then he made sure we would be too far apart to ever make contact with each other - the only part of the universe that we can realistically contact is our own solar system .
So to cut a long story short , the Abrahamic religions would not be affected .
Are the people of Earth really special ? - I'll answer that rhetorically - Ask the people of Mercury , Venus , Mars , Jupiter ...etc. ... whether or not the people of Earth are special and you'll have your answer.....