Originally posted by azn_redneck
Yes. As Christians we are commanded to love one another and be a light to the world (easier said than done). Alas, this quality does not show through in many a Christian. No one but God is perfect. Our job is to walk in obedience to God as best we can (some days are better than others).
You are the light of the world. A city set on a hill cannot be hidden; nor does anyone light a lamp and put it under a basket, but on the lampstand, and it gives light to all who are in the house. Let your light shine before men in such a way that they may see your good works, and glorify your Father who is in heaven. Mat. 5:14-16 (NASB)
As for those who do not believe in God, such a belief is obviously contrary to Christian beliefs. Thus, we do in fact believe that they are wrong in thinking so, and that not seeing God personally is not an excuse for non-belief as noted in Paul's letter to the Romans:
For since the creation of the world His invisible attributes, His eternal power and divine nature, have been clearly seen, being understood through what has been made, so that they are without excuse. Rom. 1:20 (NASB)
I'm not an expert in the subject, so I may not be presenting a particularly compelling case for faith. However, I make no apologies for being a Christian. It is not necessary for you to agree with me, you are free to believe what you like. When I die, and there is no God, then I haven't really lost anything. But, if I die and there is a God, then I have eternal life and a nice place to live. 
My thing is this, if someone doesn't believe in Heaven and Hell they should not be preached at and told they are wrong that is what is happening, you people were offended by his sig for having a atheist view. It's his opinion and you don't have to agree with it. Christians IMO are as annoying as Mormons who solicte their religion, I don't like them coming up to my house every other day asking me to convert to their better god, and I don't like people telling me that because I am not a Christian I am wrong about everything I believe. To me they come off as if you are not with us your religion is a lie and you need to convert with our mass missionaries who jam it down your throat.
*EDIT*
Don't get me wrong, I am a Christian at heart, but I don't like how the religion is forced in a sense and how it's black and white with other religions to them. I also believe in my Native beliefs of the after-life, I just don't like how people feel that someone can't have an opinion on religion without a bashing cause his thoughts are wrong cause a book told me so.