Because you’re in a European-style church, yo. Christian art depicts Jesus and the other Biblical figures as whatever the race of the artist/region is. Don’t believe me?

Here’s a Chinese painting of the Baptism of Christ:

Here is a Native American painting of the Nativity:

Here’s a painting of Jesus giving a sermon by a Kenyan artist:

And, lastly, here’s a European painting of Jesus healing the blind:

If you live in a country or region where the culture is primarily European, expect to have that reflected in the art you see.