JohnR7 said:
What is "deductive reasoning"? Can you show me how you use this process to determine that the earth is old?
The "if ... then" statement is deductive reasoning.
IF the earth is old, THEN there will be no short lived radioisotopes that are not generated from other isotopes. That is an example. When tested like that, the "then ... " is confirmed. This supports the idea of an old earth.
However, deductive reasoning definitely shows a YOUNG earth to be wrong. IF the earth is young, THEN there should be short lived radioisotopes not formed from other isotopes. The complete absence of those isotopes shows the earth is NOT young.
What assumptions do they make. For example I suggested that you have to assume that the universe is real and not an illusion. We can not prove that, but we have to assume that, or we would not be able to proceed.
I know I've posted this to you before, John, but LISTEN this time, will you?
Both science and Christianity have assumptions about the nature of the universe. Christianity derives the assumptions from the nature of God. So BOTH science and Christianity have the SAME assumptions.
Here you go:
"The search for truth in science is based on agreement concerning just such basic assumptions. It is a gamble, if you will; a gamble that certain articles of faith which cannot be proved by science are nevertheless well-founded enough to provide a springboard for all scientific investigation. It is intriguing to find that religion shares much of science's basic view of reality. How is it that two approaches, science and religion, both claiming to be avenues of truth but in many ways reputed to clash with one another, should be in agreement on so basic a level? ...
"Scientists of the seventeenth century, most but not all of whom had religious views closer to my grandparents that to Hawking ... developed a procedure that would systematically separate what is true from what is not true. That is the procedure that we call the scientific method. It has served us splendidly ever since its birth and made our spectacular technology possible. Whatever the scientific method's origins or its philosophical foundations, we have no cause to doubt its usefulness.
"Depending upon whether we believe in God, you or I might leave God out of the following." (I put the comments related to deity in [ ] to separate them.)
"1. The universe is *rational*, [reflecting both the intellect and the faithfulness of its Creator]. It has pattern, symmetry, and predictability to it. Effect follows cause in a dependable manner. For these reasons, it is not futile to try to study the universe.
"2. The universe is *accessible* to us, not a closed book but one open to our investigation. [Minds created in the image of the mind of God can understand the universe God created.]
"3. The universe has *contingency* to it, meaning that things could have been different from the way we find them, and chance [and/or choice] played a role in making them what they are. Whether this is contingency in the sense that chance [and choice] play an on-going role within the universe, or merely in the sense that there was a initial chance occurrence [or choice] which brought about this universe instead of a different one or none at all, one cannot learn about the universe by pure thought and logic alone. Knowledge comes by observing and testing it.
"4. There is such a thing as *objective* reality. [Because God exists and sees and knows everything, there is a truth behind everything.] Reality has a hard edge to it and does not cave in or shift like sands in the dessert in response to our opinions, perceptions, preferences, beliefs, or anything else. Reality is not a democracy. There is something definite, some raw material, out there for us to study.
"5. There is *unity* to the universe. There is an explanation -- [one God], one equation, or one system of logic -- which is fundamental to everything. The universe operates by underlying laws which do not change in an arbitrary fashion from place to place, from minute to minute, or even millenium to millenium. There are no loose ends, no real contradictions. At some deep level, everything fits."
"Divorced from the assumption that there is a God, these five assumptions about the universe, these five articles of faith, if you will -- rationality, accessibility, contingency, objectivity, and unity -- continue to underlie the practice of science. Some would argue that upon them depends all possibility of doing science as we know it. The best argument for their validity is not that they are obvious but that the scientific method seems to work so well! The proof (dangerous word) is in the pudding." Kitty Ferguson, The Fire in the Equations pg. 8-9
You keep getting stuck on the idea that Einsteins gulf deals with abstract ideas.
You need to get past the blindness that evolution has no supporting evidence. The only gulf that exists is in YOUR knowledge.