I am a Christian.
I have a friend who is a member of a strict (nonconformist) christian sect which teaches that only their version of Christianity is truly valid.
We don't tend to speak about religious matters (we know each other through a support group for parents of neurodiverse children)
She has invited me to an evangelism event "It's time to seek the Lord ... come and hear the Good News that Christ died for our sins and rose on the third day, all are welcome". I'm not sure how to respond in a way that is understood as kindly as the invitation is intended, I don’t want to be rude or flippant but I don't need evangelising and really don't want to be evangelised, I am already saved (although she probably thinks I am not saved enough).
How would you say "thanks but no thanks" in this scenario?