The fundamental issue at hand is that there is NO religion that can offer up empirical evidence as proof.
I think most theists would disagree wholeheartedly. They would say that the evidence of God's love and presence is literally all around us. It's simply that you're denying these empirical phenomena as empirical evidence for a god.
Many scholars have advocated something called a sensus divinitus, or a divine sense that can detect God's presence. So, imagine I'm blind and you're not and there's an island off in the distance. You can tell me all day that there's evidence for the island's existence right there. Yet, because I lack the sense necessary to detect the island, I just don't believe you.
The point of the analogy was to show that not seeing evidence is quite different from there not being any evidence whatsoever.
These are OPINIONS. As we all know, opinions do not make anything a fact, no matter how many people share the same opinion.
There's plenty of philosophy to refute this claim, even insofar as what constitutes a "fact". But this point aside, there do exist some pretty convincing proofs out there for some kind of creator. Maybe not the Judeo-Christian God, but some sort of entity with a purpose. While I reject these theories as well, at what point does my view become opinion versus their view? I don't have any fancy proofs to counter theirs, so who's to say what really constitutes an opinion?
Atheism is not saying there is no such thing as a god. It is a position that there is no evidence for god, and we choose to not believe without evidence.
This is a misconstrued version of atheism that verges on agnosticism. Atheists must, to be an atheist, assent to the proposition that no god/deities exist. It is not a lack of belief in a god, which would qualify as agnosticism. It is an assent to the proposition that is essentially the negation of the theist's position.
There is also the sticky matter of whether or not we can actually choose what we believe. Your statement here puts the atheist in a tough position to get out of because you're committed to the view that we can pick and choose what we believe. And that just seems false.
I can't speak for others, but I know that if I saw real evidence I would convert immediately, and it's a safe wager that most other atheists would as well.
Even if God Himself came down and spoke to me, I would sooner believe that I've completely lost it rather than some magical man from the sky is talking to me. My beliefs on this matter deal with probabilities, and I find the notion of a God close to being logically inconsistent.
My fundamental issue with religion is that it demands acceptance without evidence, and that is spilling over into other aspects of society.
Fruit from the poisoned tree. The premises, as I have shown, are contentious at best. This makes for nothing more than a strawman of the theist's position.
If part of your faith is to evangelize and spread the news of God's love, then how we can really fault people for trying to do this? Sure, it's irritating as hell. But it's not the worst thing in the worlds. Besides, it's typically good fun messing with those guys.