Will I damage my voice if I sing soprano for church choir and I'm normally a low bass?

My church's choir is lacking in women (especially sopranos) so I was asked to sing Soprano in falsetto. I'm normally a bass, but I have a powerful falsetto; I can reach the A above the treble clef without effort and the D above that with effort. Will I damage my voice at all/lose my bass voice if I do this week in, week out?