In your opinion, (1) do we know what the original manuscripts actually said and (2) does it matter?
There is no reason to doubt that the oldest manuscripts we have were altered or copied incorrect to a degree that mattrs theologically.
Does it matter?
It depends on the individual I would say.
For some YES, it does matter but for others, not as much as you'd think.
There are some great reads on this subject, the works by Bruce Mtezger in regards to the OT are without par in my opinion.
And No, while Bart Ehram raises some interesting points, there is no evidence to back them up.