If a person wears a cross around their neck does it most probably mean that they are very religious?

I met a nice man and we went on one date. It was fantastic and we kissed! He is a surgeon. Anyway just now while I was going through his pics I noticed that in every photo he wears a cross. I didn't notice in person because it's winter so I guess he's keeping it inside, but I'm a bit surprised that a highly educated surgeon with 2 phd's would be religious... He never mentioned it, we basically didn't even talk about anything related to God or religion. I don't want to jump to conclusion before asking him, but what are your thoughts?

If a person wears a cross around their neck does it most probably mean that they are very religious?
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