Thomas became a believer because he could touch Jesus, that level doesn't make a return until the Church is measured in Re:11 and at that time there is 42 months until the return and the sheep/goats judgment from Matt:25.
From the start of the time of the Gentiles' in 70 AD (Luke:21:24) faith was gained by reading the book and part of that said to repent your sins by private prayer to God. Those prayers would make it to the alter in the temple in Re:4.

If you want to understand about the 'bruise to the head' from Ge:3:15 you would be better off using Revelation to set the sequence and timeline and then use all the relevant OT prophecies to fill in the fine details. With 24 passages or so that are specific to the 'day of the lord' being about the 7th trump sounding and the events that happen.