I Kings 12:25-33 records the beginning of the Kingdom of Israel's apostasy. Fearing that he might eventually lose political control over the ten tribes because of their long-standing religious ties to Jerusalem, capital of the Kingdom of Judah (verse 27), Jeroboam I instituted a state religion designed to meet his peoples' needs for convenience - and his own need for power. He built two shrines, one in Bethel, at the southern extremity of his kingdom, the other in Dan, near its northern boundary (verse 29). If not de jure, at least de facto, he exiled the Levites, the priestly tribe established by God, and installed in their place a priesthood of his own devising (verse 31). Finally, he moved the fall holy day season from the seventh month to the eighth, thereby effectively setting aside the Sabbath commandment, since the holy days are God's Sabbaths (see Leviticus 23:1-3, 23-44). All this "became a sin" for Israel (I Kings 12:30).
Jeroboam's apostasy, his movement to false religious practices, took deep root. In fact, the house of Israel never departed from the practices he established. II Kings 17:21-23 records this fact:
Jeroboam drove Israel from following the LORD, and made them commit a great sin. For the children of Israel walked in all the sins of Jeroboam which he did; they did not depart from them, until the LORD removed Israel out of His sight. . . .
Having abandoned the Sabbath, the God-given sign marking them as His people (Exodus 31:13-17), the folk of the northern tribes eventually lost their identification. That is why most Israelites do not know who they are to this day. The forefathers forsook the sign that denoted their connection to God.
Take this line of thought to its logical conclusion: The Sabbath is a memorial to creation and, by extension, to the Creator God (see Exodus 20:11). Modern-day Israelites do not know who they are today because their forefathers, generations ago, abandoned this memorial to the Creator God. Therefore, modern-day Israelites have come to abandon more than the sign: They have abandoned the God to whom the sign points. They no longer know God.
This is not an overstatement. Make no mistake: Failure to recognize who Israel is today is failure to recognize the God who made Israel! The distressing secularism running rampant in the modern nations of Israel today has its roots in Sabbath-breaking. The antidote for secularism in America is not an inane Constitutional amendment requiring the teaching of creationism in the state schools. The panacea some offer, prayer in the public schools, will not do the trick. Increased Sunday church attendance will not stanch the flood of secularism; after all, most Sunday worshippers accept the doctrines of biologic and economic determinism (i.e., evolution and socialism, respectively) just as avowed atheists do. Attempting to unite a people with its God through these measures is surely akin to building a wall with "untempered mortar" (see Ezekiel 13:9-23). In the coming storm, such a wall will fall.
However, one will never find a Sabbath-keeper who is a secularist, for the Sabbath-keeper has maintained his link with the Creator God. Sabbath-keeping and secularism mix about as well as oil and water.