I say "Gesundheit". Also, I get very annoyed when sales clerks tell me to "have a blessed day", arghhh.

God Bless you-old habits die hard.

I do it too but more so out of habit, rather than by the actually meaning. I've tried saying "excuse you" but found it to sound passive aggressive sometimes haha

I tell them to shut up.

Every once and awhile. But the whole practice of saying anything is pretty odd, especially when you consider the origins.

I also say "bless you", but not god bless you.

Nope.

I would not be too concerned about it. There are a lot of phrases and words in our vernacular that had religious origins, but many/most of them no longer really carry any religious significance.

Well when I do it, I usually just say, “Excuse me.” Lol when someone else do I usually say,” Excuse you.” They usually respond by saying,” Thank you.” Every once in a while I will get someone that will say,” You don’t believe in saying bless you.”

Yes I do...lol

If it's a female that I would like to have a conversation with I will say it and then I will start talking to them about the origins of that saying. If they already know the origins we can have further conversation and if they don't we can still talk further. I don't even think about saying anything if a man sneezes.

I say 'gesunheit', which sometimes prompts an inquiry, my explanation, and a juvenile response from them.