To equally divide the English alphabet into two groups, you would first need to determine if you are dividing it based on the number of letters or the order of the letters. If dividing based on the number of letters, you would split the 26 letters into two groups of 13 letters each. If dividing based on the order of the letters, you would separate the alphabet into two groups of alternating letters, such as A, C, E, etc. and B, D, F, etc.
You don't. The Greek alphabet is quite different from the Latin alphabet (which is used for English).
The alphabet has 26 letters. The letter "D" comes after the letter "C".The English alphabet, in order:ABCDEFGHIJKLMNOPQRSTUVWXYZ
No one discovered the English alphabet. It was invented by Catholic monks who adapted the Latin alphabet to fit English.
The Latin alphabet of Rome had 23 letters, and the English alphabet uses 26 letters.
All English speakers use the English version of the Latin Alphabet.