16 Is not the cup of blessing which we bless a sharing in the blood of Christ? Is not the bread which we break a sharing in the body of Christ? 17 Since there is one bread, we who are many are one body; for we all partake of the one bread. 18 Look at the nation Israel; are not those who eat the sacrifices sharers in the altar? 19 What do I mean then? That a thing sacrificed to idols is anything, or that an idol is anything? 20 No, but I say that the things which the Gentiles sacrifice, they sacrifice to demons and not to God; and I do not want you to become sharers in demons. 21 You cannot drink the cup of the Lord and the cup of demons; you cannot partake of the table of the Lord and the table of demons. 22 Or do we provoke the Lord to jealousy? We are not stronger than He, are we? –1 Cor. 10:16-22 NASB
When we take the Communion, we are all symbolically partaking of the same body and the same blood. This has been true ever since Jesus set the example with the disciples in the Upper Room. No matter what time it is in eternity, we are all bound together by that one body and one blood and it will be culminated in heaven when we all partake of the Communion at the great banquet table. So, we should never defile that practice by partaking of anything that has been sacrificed to idols or to demons of any sort. We cannot serve two masters and our God is a jealous God. We do not want to provoke Him.
13 But you shall destroy their altars, break their sacred pillars, and cut down their wooden images 14 (for you shall worship no other god, for the Lord, whose name is Jealous, is a jealous God), —Exodus 34:13, 14 NKJV
While we may not bow to wooden or golden images, we can still have things that we treasure more dearly than our relationship with God. These things or people are just as much an idol as any graven image. Each of us needs to ask the Holy Spirit to show us the things in our lives that grieve Him. Those things are our idols.
23 Search me, O God, and know my heart; try me, and know my anxieties; 24 And see if there is any wicked way in me, and lead me in the way everlasting-Psalm 139:23, 24 NKJV