Anyone that thinks that gay marriage should not be legalised because of religious beliefs are literally wrong
No they aren't. They just hold a different opinion and belief system to you. One which they are perfectly entitled to hold, just as you hold yours. Are people not allowed to hold different opinions, likes and dislikes now?
People should be able to voice their opinions, but again we should not pretend for a second that opinions are equally valuable morally or intellectually.
Why, just because it differs from yours?
Look up tolerance in the dictionary, and then have a look in the mirror.