Doubting Thomas was not left doubting for too long,according to the book,Jesus gave him evidence by appearing to him,as per Thomas'request! Not so all those who also doubt and ask for evidence of his existence.
Since Doubting Thomas was not condemned for his skepticism,I don't see how we can be.
Also the Apostles didn't believe either,so,Jesus appeared to them all,up to 500 persons,why not us?Of cause this based on the book,The Bible.
Blueblades