Why is space not an object in your opinion?
Well, let's start with the general definition:
An object is
"a material thing that can be seen and touched",
"something that can be perceived by the senses".
If you think space is not a single point, does that mean it is discrete?
Space is a poorly-defined term that is usually invoked to juxtapose against "not here on Earth" or "not inside my spaceship".
It is a poor subject for a meaningful discussion about the nature of the universe.
It would be a little like trying to divine the wisdom of "War and Peace" by examining the properties of the "negative space" on the pages - that's the areas that
aren't covered by letters.
Why do you think that nothing can move at infinite speed?
This is not merely my opinion. Our current best theories, and all experimental evidence, indicates that all massive and non-massive objects are limited by the speed of light.
The exception to this is that some very distant objects appear to be receding from us at greater than the speed of light. This is believed to be due to some force that is causing space to expand, which we have labelled "Dark Energy". This expansion is not limited by the speed of light. Cosmological Expansion is a very active area of research, and we do not have all the answers yet.
If the universe is finite, what does its edge look like?
Not all finite things have edges.
For example, an ant could walk the (finite) 2-dimensional surface of the Earth forever and never encounter an edge.
The term is"finite but unbounded".
It began expanding at the Big Bang. Gravity is slowing this expansion to some extent, but it is not clear yet whether the universe is "closed" (will collapse back on itself) or "open" (will continue expanding forever).