“Then saith he to Thomas, Reach hither thy finger, and behold my hands; and reach hither thy hand, and thrust it into my side: and be not faithless, but believing. 28And Thomas answered and said unto him, My Lord and my God. 29Jesus saith unto him, Thomas, because thou hast seen me, thou hast believed: blessed are they that have not seen, and yet have believed.” Jn. 20:27-29
A person will be more blessed if they believe without seeing, but if it takes seeing a miracle to keep someone out of hell, then let them see it Lord. I would rather be rebuked for needing to see a miracle before I believe, than not believing at all.