Jeroboam made a manmade religion:
So he offered upon the altar which he had made
in Bethel the fifteenth day of the eighth month,
even in the month
which he had devised of his own heart;
1 Kings 12:33
What was Jeroboam, with all his innovative, new, creative worship techniques remembered for?
....and followed the sins of Jeroboam the son of Nebat,
which made Israel to sin;
2 Kings 13:12
...he departed not all his days from the sins of Jeroboam .
the son of Nebat, who made Israel to sin.
2 Kings 15:18