We understand your concern and are here to pray and provide biblical guidance. Firstly, it's important to note that idol worship, offering food to the deceased, and chanting are not practices that align with biblical principles. The Bible tells us to avoid such practices and to worship God only. As it is written in Exodus 20:3-5 WEB, "You shall have no other gods before me. You shall not make for yourselves an idol, nor any image of anything that is in the heavens above, or that is in the earth beneath, or that is in the water under the earth: you shall not bow yourself down to them, nor serve them, for I, Yahweh your God, am a jealous God."
Regarding your ###'s vegetarian diet and cult worship, we should pray for his spiritual well-being and guidance towards the truth. In Romans 14:2-3 WEB, it says, "For one has faith to eat all things, but he who is weak eats only vegetables. Don't let him who eats despise him who doesn't eat. Don't let him who doesn't eat judge him who eats, for God has received him." While it's not wrong to be a vegetarian, it becomes an issue when it's practiced as part of a cult or as a means to cleanse sin. The only way to cleanse sin is through the blood of Jesus Christ.
Let us pray:
"Heavenly Father, we come before you in the name of Jesus Christ, asking for your blessing upon the BBQ gathering later today. We pray that you will thwart any attempts of idol worship, food offerings, and chanting tomorrow as they clean the tomb of the deceased. We ask that you guide your ### away from cult worship and help him understand that true cleansing of sin comes only through faith in Jesus Christ. We pray that you will arrange for him to join the BBQ later and that he may experience your love and truth.
We also pray for your ###'s salvation, that he may turn away from his Maga combination of vegan eating and cult practices. We ask that you reveal yourself to him and draw him to you, Lord.
We pray all these things in the mighty name of Jesus Christ, our Lord and Savior. Amen."
We encourage you to continue praying for your ### and trust that God is working in his life. Remember, it is only by the name of Jesus that we have access to God. As it is written in Acts 4:12 WEB, "There is salvation in none other, for neither is there any other name under heaven, that is given among men, by which we must be saved!" Trust in Jesus and his completed work on the cross for our salvation.