I know that they mean that our God doesn't avoid using matter in acheiving healing or miracles or in using His power. Which you seem to be saying in scoffing at crosses or holy water as mere "symbols."
(1) What was the significance of mixing Christ's saliva with dird?
I'm sure you'll tell me. God of course breathed life into dirt originally so you can see him using dirt again to heal. Christ didn't just say "you are healed," he made a point to use matter. He didn't eschew it like you do.
(2) What is the significance of annointing with oil and where did it originate?
The annointing of the kings and priests in the Old Testament. To be annointed was God's sign of protection or selection of the person annointed.
(3) Did the cloak heal anyone or was it the spirit of God emanating from the Lord?
Did the mud heal or was it something to do with Christ? Did the oils heal or did it have something to do with faith and prayer? I recognize the source of healing, I'm not dumb. But you don't recognize that God does indeed use matter.
SD
The things used of Christ were commonalities - things that were practiced of the Lord prior (the oil use), things used before in creation *(the dirt), and finally, the cloak of Jesus which bore no power, it merely clothed him that had the power. Crosses have no power, not even with prayer. Candles have no power - even with prayer. Little wax impressions and the like have no power. God's power resides with him - not a man. God's power is release of Him and in His direction and Will. Wizards and Witches 'enchant' items by attaching demons to them through incantations (requests of the demons to do as they are bid). God does not work in this way. Jesus didn't bless the dirt and heal the man with dirt. He didn't bless the robe and heal anyone with the robe. He didn't bless anything and use it to heal with. He called upon the power of His Father, who's will He worked, and healed directly.
You're 'enchantment' of relics is witchcraft.