ahmed2010, your video is dishonest.
People are prepared to give you straight answers so your claim that atheists avoid answering is a lie.
I suggest you improve your own standards of accuracy before demanding a high standard of response from other people.
However, for what it is worth I will give you my answers.
1/ No, the universe has not existed forever. To the best of our knowledge it is around 14 billion years old.
2/ We don't know. We may never know. At least we are prepared to admit we don't know instead of making things up.
3/ Again, we don't currently know. It will not exist in its present form forever though. Look up "heat death".
4/ Maybe. This is something else we don't know.
5/ It certainly looks that way. Cause and effect only applies
within our universe.