Like many replies I get, there is an attempt to invalidate my reasoning on a particular point by trying to ridicule it using some arbitrary fictitious subject,
You've not supplied any reasoning, you've just made blanket declarations of faith.
...but the points I make can be compared to individual pieces of the jigsaw which, when put together, make sense of the whole reality of our existence.
The various pieces of the Lord of the Rings, The Hobbit and The Silmarrilion (sp?), when put together, hold up with a sense of internal logic, but that doesn't mean they're real.
It is comparatively easy to pick on a piece of this jigsaw and claim that on its own it makes no sense.
Then you have a problem with your rationale.
But putting them all together they fit well enough to offer substantial evidence for the spiritual nature of human beings and the existence of God.
No, they don't. They define a possibility, a conjecture, but there's still no justification for accepting that premise and not any of the other unevidenced conjectures. Why that 'spirituality' and not, say, Hinduism, which has an equally historic, prestigious, widely-followed and internally consistent set of justifications and explanations, and an absolutely equal dearth of evidentiary support.
We have the existence of human free will,
No, we have the claim of it, and no logical explanation by which it can possibly exist
conscience, self-awareness
Which doesn't require any concept of 'spirituality' to accept
miracles
which, by definition, are events for which we don't have enough evidence to explain; as 'evidence' for something spiritual they are an argument from ignorance predicated on 'you can't explain it therefore (my understanding of) god'
witness stories
which suffers from any number of flaws, not least of which is the well-established fact that eye-witness testimony is highly unreliable, especially as time after the purported events increases
answers to prayer
none of which appear to happen for, say, amputees? Only for people with otherwise curable or potentially self-limiting conditions. How many unanswered prayers do there need to be before 'answered prayers' just becomes natural variation in an immense data set, cherry-picked by selection bias?
four independently written gospels
Two (possibly) independently written gospels, and two others heavily based on those, all of which contradict each other, all of which were written by unknown people claiming to have been eye-witnesses to events decades before their writing, which have subsequently been edited before being deliberately selected from a broader range of even more inter-contradictory accounts, and subsequently edited again by vested interests before being poetically and selectively interpreted through at least two languages.
highly improbable sequences of events to create life
We have no idea how improbable it is, because a) we don't know the exact requirements and b) we don't know how many chances there are out there
the human tendency to search for God
easily explained as apophenia, a manifestation of the demonstrable survival trait of pattern recognition shading into perceiving meaning in otherwise random events
incredibly precise conditions needed for the creation of stars an galaxies
incredibly precise conditions for those particular manifestations - who is to say that with a different physics we wouldn't get different stars? How many different universes are there for those 'incredibly precise' conditions to randomly emerge? Is there any possibility of the conditions being different?
Each of these points (and more) can be argued with individually, but putting them all together shows how they can validate the Christian faith in a way which is more difficult to ridicule as a whole.
It's only more difficult because it's more laborious, it's not as though you have a 'strong link' somewhere to hang the rest from, it's a house of cards. You have nothing that isn't either an argument from ignorance or begging a question. Why the Christian version (and WHICH Christian version) and not Scientology's, or Buddhism's, or Norse? Why posit non-natural explanations for phenomena in the first place?
O.