What does other really mean ? And an even harder question …. what does “totally other” really mean.

We will begin with nothing, the best place to start. The existence of time means that everything had to have a beginning. You cannot have the existence of things without time. No time – no existence.

The creation of “stuff” and time means that some “thing ?” that is outside and totally other to our domain of space and time must have caused the creation of our space/time domain. This OTHER thing is what we call God.
N.B This “god” can not be described as a thing because He is totally other to every THING. What you call him or what denomination you use is not important at this level of discussion. More important to know and accept the logical reality of His existence.