It is their window, and their choice what fills it.
It would have been better had they done as Aberrant suggests, and steered clear of historical figures rather than non-confrontational religious ones.
It's worth considering that in removing one unsuitable image, they may well be replacing it with another unsuitable image, because, by trying to convince everyone how woke they are, they are singling out another secular figure which really has no place in this setting.
Why not find a saint and pop him or her in there, and stop trying to convince everyone that the church is not racist.
It's a church for heaven's (!!) sake - surely anyone who is remotely interested in it can take a position of anti-racism as read?