We should not be too persistent, the church is incorrect to do,
we should allow the holy spirit to convict them of their sins and
lead them to repent and to church, but we all must play our role to
spread the gospel to those unsaved , as this will be the only means
of exposing non christians (pre-believers NOT non-believers,
atheists, check the difference of these words before you post !) to
christ.
And it is also written in bible for us to preach to others