The first time I came into contact with BTC, I felt that there was little difference between e-payment and BTC. However, with the gradual understanding, e-payment and BTC are becoming more and more different.
In essence, electronic payment is the circulation of legal currency in one or some countries, while BTC is the circulation all over the world（ If every country agrees)
That your explanation of electronic payment is wrong, electronics payments are available to be used in most places around the world, and there is no difference between electronic payment and Bitcoin, Bitcoin is also an electronic payment. The meaning of electronic payment stands non-cash transactions that are done without the need for a paper check or physical cash.
There are lots of electronic payment methods around these days, Bitcoin, PayPal, Payoneer, and a lot of them. The difference between Bitcoin and other electronic payment methods is decentralization; while other payment methods can’t function in all the states/countries due to one reason or the other, Bitcoin can be used anywhere around the world, whether legal or illegal.