What Civilizations have a sun god?
This question isn't up to standards because it is a list question asking for all the mythologies. Instead try asking - "Did x civilization have a sun god?"
What animals affected Egyptian mythology?
This once again is a list question. Instead ask "Did "animal" affect Egpytian mythology?"
Was "religious figure" actually born in x?
This is straying from mythology and going into religion. While it may be considered a myth it isn't considered mythology.
What is the best Roman "God Weapon"?
This is opinion-based and is frowned upon. You should ask what the different characteristics of weapons are and then judge them for yourself.
What are the similarities between various mythologies all around the world?
There are so many mythologies that it would be impossible to answer this. It takes a huge list of same and differents. This would normally be considered a closed question for "unsure as what you are asking". Try to narrow it down like "Is there a similarity in warfare between X and y?"