Sublime Text 3 is my best Text Editor and I use it mostly for Development and for every other editing since I moved from Windows to MAC.
Yeah!, I lost my touch on Ms Office, anyways everyone started using Gsuite or Google Docs.  I hope to come back to MS since they are moving very fast to the cloud.

The end goal was to be able to write a commit message in Sublime Text without using the Sublime Text 3 Plugins.

Check if You have Symbolic link for Sublime Text

Check that Sublime text 2 or 3 has a symbolic link mostly in your user bin directory
I assumed that you put your sublime symbolic link in the default location

$ find /usr/local/bin subl -maxdepth 1 -type l -ls

OR SIMPLY

$ cd /usr/local/bin
$ find subl

If you did not find it that means you have not created a symbolic link for Sublime

Create a Sublime Symbolic link

In your terminal,

ln -s "/Applications/Sublime Text.app/Contents/SharedSupport/bin/subl"

if you do this now you should be able to see that subl  is in your bin directory

$ cd /usr/local/bin
$ find subl
subl
$

Check your Profile

You need to make sure your system recognizes the symbolic link you just created.

Open Your Profile file

open ~/.bash_profile

This would open your profile file in Text Editor. You can check that *Export* contains $PATH that is directed to *bin*

export PATH="/usr/local/sbin:$PATH"

Test !

$ subl

This should open the Sublim text

Setup Sublime for Git

If you have setup your Sublime Text to open with subl  has symbolic link then you can do this

$ git config --global core.editor "subl -n -w"

You should have added Sublime Text Editor has the Text Editor that would open when  you want to commit 

$ git add . && git commit 

That would launch Sublime text