Part 2. “ Reason is abstract, that is true. Yes, fact is abstract, yet facts can be supported with evidence. “
Facts or knowledge claims are produced by data, and data must be interpreted. Since your senses are unreliable, The conclusions one draws from interpretation of data is wholly predicated on where they stand on the issue of God. If you start with the assumption of no God, your interpretation of data will flow from that position.
Let me give a perfect example of this. A theist asks an atheist to account for morality, and how do most atheists typically attempt to justify this? By evolution. Most atheists invariably point to evolution to justify morality by pointing to social species corroborating with one another or showing empathy. This has occurred in every conversation I've had with atheists on morality.
If the God of the bible exists, which he does, macro-evolution didn't occur, and neither would morality be a matter of evolution. If you draw faulty conclusions, other faulty conclusions will flow from this. This is precisely why much of modern “science” is a mess and one big house of cards. This is especially true in the applied scienceswhere science is dependent on prior “ scientific “ findings.
“ When you say that God must be presupposed, you haven't shown why that is the case. “
I just did above.
“ Also, even if reason and fact are abstract things, so what? Some things are abstract. “
The so what is that your materialistic world view and epistemology can not account for this. More specifically, it can't account for the fact that logic is universal, immaterial, and is true regardless of what opinions one holds. This flies directly in the face of the subjectivitism and relativism taught in lieu of objective truth, reality, and morality in most secular universities today.
“ What evidence is there that this is true? “
You invariably want to assume and point to naturalism in asking these questions. This is highly problematic for you and is actually making my argument for me. This isn't a question of “ evidence “ but of theistic epistemology which your naturalistic views reject nor can afford.