I guess they seek after signs like that for reassurance of their faith, although it's not faith in God's word. Jesus actually told the apostles how he would manifest himself to them in John 14.
John 14:21 He that hath my commandments, and keepeth them, he it is that loveth me: and he that loveth me shall be loved of my Father, and I will love him, and will manifest myself to him.
22 Judas saith unto him, not Iscariot, Lord, how is it that thou wilt manifest thyself unto us, and not unto the world?
23 Jesus answered and said unto him, If a man love me, he will keep my words: and my Father will love him, and we will come unto him, and make our abode with him.
24 He that loveth me not keepeth not my sayings: and the word which ye hear is not mine, but the Father's which sent me.
25 These things have I spoken unto you, being yet present with you.
26 But the Comforter, which is the Holy Ghost, whom the Father will send in my name, he shall teach you all things, and bring all things to your remembrance, whatsoever I have said unto you.
The fact that you have been learning the things you have is part of how Christ manifests himself to you and I like that you are choosing to put your faith in God's word rather than gold dust and other signs like that. I think it supports what Chris was talking about earlier how the born again babe will grow in understanding while those that are of the world do not.