Really? I am confused as to why you believe that it would make the best gift for them.
I can understand how advantageous a belief like that can be. But like you mentioned, there is an issue with its lack of proofs. That doesn’t mean it has to be thrown out the window. But wouldn’t it be better if kids grew up with the foundations of being good human beings, with awareness of the concept of God, but not actively made (read: encouraged) to believe in one?
I feel that it is wrong to teach your kids something you don’t believe in, yourself.