Who we are guide

So many people want to grow in their faith, but feel overwhelmed by the bible.

At Sunday we create resources to make it easier for you to understand the Bible and to grow in your relationship with God.


Our core values are the
foundation of who we are
and where we are going.

Every decision is run through these values in order to
remain focused and maintain a clear message all around.

Help People Grow

Our main purpose as a company is to make it easier for people to understand the Bible and to grow in their relationship with God. That’s what we are here for.

Be Excellent

In everything we do and everything we create, we want it to be done at the best of our ability. This is why we focus so much on the details.

Be Generous

We know that none of our success is possible without God’s hand on it, so we strive for over-the-top generosity with our finances, time, and wisdom.


The Bible Study

The Bible Study: Youth Edition

Sunday Clothing

Sunday Journal

The Best Season Planner

Sunday Bible Trivia

Sunday Table Talk Card

Sunday School: The Basics


This is one of our key phrases at the brand Sunday. We put it on every product.


The Bible:

The Bible is God’s Word. It is accurate, authoritative, inspired and applicable to our everyday lives.


There is one true God consisting of three equal persons: God the Father, God the Son, and God the Holy Spirit.


Sin has separated each of us from God. In order to receive forgiveness and become a “new creation”, we must repent of our sins, believe in the Lord Jesus Christ, and submit to His will for our lives.

Jesus Christ:

Jesus Christ is God the Son. On earth, Jesus was 100% God and 100% man. He was born of a virgin, lived a sinless life, performed miracles, died on the cross for mankind, which atoned for our sins through the shedding of His blood. He rose from the dead on the third day, ascended to heaven and will eventually return again in all of his glory


Sanctification is the ongoing process of yielding to God’s Word and His Spirit in order to continue the development of Christ’s character in us. It is through the Holy Spirit and the Bible that we are enabled to live a Godly life.

Heaven & Hell:

Our eternal destination of either Heaven or Hell is determined by our response to the Lord Jesus Christ. Heaven is the eternal dwelling place for all believers and Hell is a place of separation from God for all unbelievers.

Second Coming:

Jesus Christ will one day return again for his “Bride”, the church, and will restore earth to its original intent forever.


We are saved by grace through faith in Jesus Christ. Jesus died and rose again just to pay the price for our sins. Salvation doesn’t come from our good deeds or by doing anything special, it’s a free gift from God just because He loves us so much. We need to turn away from of our sins, believe that Jesus Christ is God’s Son and our Savior, and submit to Him as Lord of our lives. By doing so, we receive salvation and eternal life.


Zach Windahl

Zach Windahl has helped thousands of people understand the Bible better and grow closer to God. It is his goal in life to create resources to make it easier for people to understand the Bible and to grow in their relationship with God. He runs the brand Sunday and is the author of several books. He currently lives in Miami, Florida.


Gisela Windahl

Strategy, product development

Caleb Cruse

Assistant, product development

Breeanna Graham

Admin assistant

Tristan Publishing


Katlyn Hovland



Social media ads, digital support, email campaigns

Paul Weaver

Photo and video

Josiah Davie

Social Media


We use this phrase frequently because we believe that Sunday is the best day of the week.


At Sunday, we know that you want to grow in your relationship with God

In order to do that, you need to understand the Bible better. The problem is that seems like such a big task, which can be overwhelming. We think it should be easier, so we simplify things for you.

Here’s how it works:

1. We create resources.
2. You use the resources.
3. You grow in your faith.


Visit our website today, so you can stop feeling overwhelmed and start being confident in your relationship with God.