No. People already hold their beliefs, and no amount of argument, especially on the internet, is going to change them.
That being said, I've never understood why people feel the need to force their beliefs on others. I personally couldn't care less how many people believe the same things as me, it's up to them what they want to believe in. But if someone engages me in debate, then I will gladly answer the call and use all the knowledge at my disposal to counter their arguments.
Really, there are two different scenarios that need separating. The first is when people pretend to have a serious discussion but instead use it as an attempt to shove their beliefs onto others, without maintaining any semblance of a rerasonable discussion. The second is a genuine discussion about a given belief, wherein (hopefully) both sides are open-minded and willing to change their beliefs if given a reason that is compelling enough. Sadly, the second type is extremely rare, which leaves us, in most cases, with the first scenario. In that case, no, people will not change their beliefs, because the purpose of their involvement is to 'convert' others, not to listen to rational debate.
