I claimed that what you cannot prove to exist, you cannot claim
to exist. 
As if you know how a scientist think. For your information,
scientist do not bother to consider anything that is not
falsifiable. 
Create a ghost for ? 
Anyone that uses "beliefs" like "belief in the existence of
ghost" would in no way be able to create / invent anything of use,
much less an atomic bomb.
They would be wasting all their time trying
to create a "ghost explosive". They would be wasting all their time
trying to utilize the power of ghost to defeat the enemy. 
Why do you believe in such rubbish?
I am a REALIST, I live in REALITY... you are not careful, you
will be living with those living in fantasy and living in IHM.