Jesus invited Thomas to do so. Why are you criticizing that? Don't you like that Jesus did that?
The answer will be quite brutal. Jesus indeed invited Thomas to do so, and for this reason Christian (especially Catholic) scientists consider Thomas their patron saint. Immediately afterwards, however, Jesus admonished Thomas:
Jesus saith unto him, Thomas, because thou hast seen me, thou hast believed: blessed are they that have not seen, and yet have believed.
So, scientists still examine things, but the general populace is just supposed to believe, because this is the MORE APPROVED way. You want to be a scientist? Fine, train, learns, and walk the thin line between reason and faith, trying not to offend either. When you offend faith, you are on your way to become an unethical scoundrel, like Dr. Mengele. If you offend reason, you are no longer a scientist, but a quack, unnecessarily sticking dirty fingers where they don't belong. This briefly sums up being a scientist AND a Christian.