You know, I don't think anyone really has an issue with you making such a statement. I think they'd just like you to show it to be so. Given that it's apparently a fact, why would you have such difficulty?
What I don't get is why you christians think that asking you to establish that your beliefs are true, or facts if you prefer, is unreasonable.
If you contend that it isn't unreasonable to ask you to establish your claims as true, as facts if you prefer, then what's the beef?
So, let me ask you: Do you have problem with people asking you to establish your claims as true, facts if you prefer? If you say "no", then there's nothing to discuss and we'll all just sit here waiting for you. If you say "yes", well... You'll figure this bit out for yourself.