The Shema

Deuteronomy 6: 4-6 is one of the most influential commandments in Israelite life and is simply called the Shema. Here God promises Israel that if they follow the Shema, everything will go well with them. Interestingly, when a scribe asked Jesus which was the greatest commandment, Jesus responded by quoting the Shema (Mark 12:28–30). God commanded the Israelites to tie the words of this commandment as symbols in their hands and forehead. In a sense, the Shema can be considered a "Mark of Yahweh" or "Mark of God". This is in direct contrast to the mark of the beast found in Revelation. Mark of the beast is any system that denies Jesus Christ as sovereign God and Savior. Denying Jesus Christ is also an automatic rejection of God the Father and Holy Spirit as Makers of heavens and earth. Here is what the Shema states

“Shema Yisraeil Adonai Eloheinu Adonai Echad. You shall love “אֵת יְהוָה אֱלֹהֶיךָ” with all your heart and with all your soul and with all your might.”

In other words

“Listen, Israel, the Lord our God the Lord are a United One.  You shall love “ the Father, אֵת (Aleph Tav) and Holy Spirit" with all your heart and with all your soul and with all your might.”

Shema has led many to reject Jesus Christ as a Being co-equal with God the Father and God the Holy Spirit. The controversy lies in the use of the word “echad”. Echad in Hebrew can imply one or unity.  The most famous verse where “echad” means unity is found in Genesis 2:24 where God said that the husband and wife will become one flesh i.e. two becomes basar echad. The other places where echad means unity can be found in Genesis 1:5, Exodus 26:6 and Ezekiel 37:19. Here are some implications of interpreting the word echad to mean numerical one versus unity. 

• If echad means numerical or singular one, then God is a single being. In doing so, it precludes the 3-in-1 nature of God.  It is in direct contradiction with what Jesus claimed i.e. He is co-equal with God the Father and God the Holy Spirit (John 14:6). 
• If echad meant unity then the Shema can be paraphrased as 

The Shema (in interpretive paraphrase):

“Hear, O Israel:

Yahweh (“the LORD” = God the Father), 
our Elohim (“God” = God the Son), 
Yahweh (“the LORD” = God the Spirit) 
are Echad (a United One).”

Three infinite Beings forming an incomprehensible perfect union. This is in line with what Jesus said in John 10:30 that “I and the father are One or a Unity!”. This would also mean that the mark of the beast in revelation is simply any belief system that denies "Father, Son and Holy Spirit" as United One.