Here is what is forbidden in the first commandment in the Ten Commandments,
Question 105: What are the sins forbidden in the first commandment?
Answer: The sins forbidden in the first commandment are, atheism, in denying or not having a God; idolatry, in having or worshiping more gods than one, or any with or instead of the true God; the not having and avouching him for God, and our God; the omission or neglect of anything due to him, required in this commandment; ignorance, forgetfulness, misapprehensions, false opinions, unworthy and wicked thoughts of him; bold and curious searching into his secrets; all profaneness, hatred of God; self-love, self-seeking, and all other inordinate and immoderate setting of our mind, will, or affections upon other things, and taking them off from him in whole or in part; vain credulity, unbelief, heresy, misbelief, distrust, despair, incorrigibleness, and insensibleness under judgments, hardness of heart, pride, presumption, carnal security, tempting of God; using unlawful means, and trusting in lawful means; carnal delights and joys; corrupt, blind, and indiscreet zeal; lukewarmness, and deadness in the things of God; estranging ourselves, and apostatizing from God; praying, or giving any religious worship, to saints, angels, or any other creatures; all compacts and consulting with the devil, and hearkening to his suggestions; making men the lords of our faith and conscience; slighting and despising God and his commands; resisting and grieving of his Spirit, discontent and impatience at his dispensations, charging him foolishly for the evils he inflicts on us; and ascribing the praise of any good we either are, have, or can do, to fortune, idols, ourselves, or any other creature. (Westminster Larger Catechism).
We ought to repent in where we have failed in this commandment. The law of God is a guide to us and we ought to delight in His law.
