It's a common claim every atheist who has ever spoken out about religion must eventually receive. I think it's actually in the theist hand book or something:
"You are closed minded!"
The real annoying part about this claim is the blatant hypocrisy of it.
I considered the claims of religion and have found the relevant claims either unlikely, impossible, or unsupported. That is not being closed minded. That is being the very definition of open minded!
I believe my beliefs are correct because if I did not, I wouldn't hold those beliefs, I would hold some other set of beliefs. I know my beliefs have been incorrect in the past, this means I could also be incorrect about my current beliefs.
Any other position is intellectual dishonesty.
But to change my beliefs you must provide evidence before I will accept it. Since I can be fooled I require real evidence before I will change my stance from the default of 'I do not believe the claim pending further evidence.' to 'I believe the claim pending further evidence.'
This is what it means to be open minded.
It doesn't mean you simply accept a claim without evidence, it means you consider it in light of the evidence.
The god claim is possible, but not probable.