I'm against religions and also an Atheist myself. They were formed in order to explain basic common knowledge, which could be proved using science. Stephen Hawking had said, that there's no way to prove that God doesn't exist, however, science makes believing in God pointless.
This only applies if the science we are talking about is the well known "real science", but there is social science right now that makes believing in something, somehow increases the capability of a person. For some instances, it can somehow relieve someone from being alone and left-out.
In my opinion, religions sparked a lot of hatred between nations (Or other religions) and were the main cause of war. (See Jihad, as a modern example, or Crusades)
Don't state it "in opinion" when history states a lot of wars and battles due to differences in beliefs/religions. It is a fact.
The world would definitely be a better place without them.
If we use logic, there will be no world without actual religion. There will be atleast one (1) specific religion that a "ideal world" may have. Cause religion is something about a social construct that if someone believes into something, there is this enticing force that drives us to join what he believes in, and without contradicting force, we all will be force to believe in one same thing.
That is correct, it's actually a fact that plenty of wars were started or had something to do with religion, like I mentioned previously. Personally, I never had the need to believe in something that can't be proved to exist. Nonetheless, I find it pointless, even in dire situations to even refer to "God", it would be a hypocrisy, can't recall doing it once in my lifetime.