Bitcoin is not a currency, and many countries issue it, and it isn't considered money. You can not use it to buy items in stores or at grocery stores. It can not be used to pay rent, electricity or water bills. So I think it is not a currency.

I disagree with you I think bitcoin is a currency people earn online and it make transaction easily people use it and invest in it and it changes life of many people and it is more than a currency. and it will be global coin soon and i am sure bitcoin will bring good days soon.

Some people don't believe in bitcoin because they don't even try yet to play in bitcoin. They did not aware what bitcoin is and at the same time they don't know the value of it.
They did not experience yet to win or to get an income to it. They don't even try to discover the power of bitcoin.

It can be use as both as the currency and the asset you are right people use to invest in bitcoin for online shopping and the payment for it, now a lot of super markets are accepting bitcoin they are going to make bitcoin as regular currency after a few years so people are investing now and it will be very good for them in future when bitcoin will be acceptable everywhere and it will be more valuable as a currency and as saving for the future.

Indeed, bitcoin does not yet meet the accepted definition of crypto currency. When such a definition was drawn up, no one could even imagine that there could still be digital money claiming to name the currency. Whether bitcoin or other crypto currency will be considered a currency depends on how firmly the crypto currency will enter our life and will be recognized by the majority of states. If this happens, then the concept of currency will be changed to include a digital currency.

I think bitcoin is not just a small currency but it will also be a global currency for all. I agree if Bitcoin is not a small currency. Because there are still many countries that do not legalize Bitcoin. And there is no government governing Bitcoin. If you think my Bitcoin is just creating a future asset.

Your definition of currency is insufficient in this context because we are talking about currency that is money (as opposed to, say, political currency)

The definition of money is:

Money is often defined in terms of the three functions or services that it provides. Money serves as a medium of exchange, as a store of value, and as a unit of account.

But bitcoin does not serve as a unit of account. The number of businesses who buy and sell things in fixed bitcoin amounts can probably be counted on one hand. Why don't people buy/sell things in dollar amounts? Because the value is too unstable.

So by those definitions, Bitcoin is not money, and it's not really currency either. (yet?)

Because most people have never heard of this one trend. For simplicity, BitCoin can be regarded as a virtual currency. Some people think BitCoin is a silly concept, while others consider BitCoin to slowly evolve into the currency of the future.

Now bitcoin does not meet the definition of currency, as dollar for example, it differs from fiat money, and this is normal it is something new and digitized. As to the existence of bitcoin in 5 or 10 years nobody knows what will happen, many things might be changed in this period of time.