There is only one thing you need to make any non-believer very angry with you:
Claim that evolution is a belief too.
Why is that so?
Because they have been taught different things for far too long.
Will people ever understand that both creationism and evolution are beliefs?
Most probably not.
Will they ever understand that both can be true?
For some christians, they already know it, but the majority of non-believers don't. They stick to the evolution because it's the only thing left to believe if you remove creationism. Well some wont believe any of it, but that puts them out of the equasion.
To sum it all up:
It's hard to have a real debate nowadays. People become crazy, take it personal and act like you said that you gonna kill them. Read
this post for example. Never was I trying to harm anyone. People just make things up to blame someone for something whenever they feel like.
How do I know all of this?
Life experience.