Christians of all denominations actively proselytise - it's a core part of being a Christian, spreading the 'good news'. This distinguishes the Christian ethos from most other mainstream religions which have a weak or non-existent missionary instinct.

So no, it's not unusual at all for a Christian to highlight the fact. From the point of view of a Christian in an increasingly secular world it probably feels more necessary than ever.

P.S. I am a Christian by birth but not vocation.