I agree with your point of view. I disagree with your use of "credit". You're not using that word in way that's consistent with its definition.
"Credit" does not mean inflationary (that's not part of the definition at all). Credit means lending. So your claim that owning or using fiat is owning or using credit is not true.
The definition of Credit in the monetary usage is:
the ascription or acknowledgment of something as due or properly attributable to a person, institution, etc.:
Bitcoin
is money. Everything else
is not credit.
Now more to your point, if we were to refer to Bitcoin (not as an investment but) as a currency that increases spending power over time we may tap into the intrigue of a whole new demographic of future adopters.
Fiat is credit. Only commodities like gold and Bitcoin can be considered monies.
To understand why that is the case, you have to understand the origins of money and banking.
Historically, “banking” was rooted in bailment – the practice of storing someone else’s goods. The depositor would leave his items for safe keeping with the warehouse and have a ticket issued. This ticket pledged that his article would be redeemable on demand. After the receipt-holder presented his ticket and paid a storage fee, the warehouse would return his item.
Some goods, however, are relatively homogenous and indistinguishable. Gold is homogenous. An individual storing 100 ounces of gold at a warehouse for safe keeping does not care whether the exact same ounces of gold he particularly left with the warehouseman are redeemed; he just needs 100 ounces of gold back.
Unfortunately, this lack of caring enables the warehouseman embezzle the items/funds entrusted with him. The warehouseman is a cunning and calculating figure. Since he knows not all his customers will demand their gold at the same time, he may maneuver within a margin, profiting off his customer’s property. At any given time, he may only have 90% of the claims he issued available for redemption; at other times, he may have 50%, 40%, 30%, 10%, or even 0%.
The warehouseman may choose to live it up – selling his customer’s gold and spending the money on yachts, women, or booze. However, if he is caught violating their trust, his customers will immediately demand their grain back; thus, running him out of business. The warehouseman can engage in another, less obvious, form of fraud and deception. Rather than cashing-in his customer’s gold, he can instead issue fake warehouse receipts. Warehouse receipts backed by nothing but identical to the genuine receipts in all aspects. He can then lend these receipts out to borrowers, collecting interest on claims to property he never had.
Since all fiat is a claim on something that doesn't exist, it is credit.
It was J.P. Morgan that said "Gold is money, everything else is credit".