But I say, that the things which the Gentiles sacrifice, they sacrifice to devils, and not to God: and I would not that ye should have fellowship with devils.

No, but the sacrifices of pagans are offered to demons, not to God. And I do not want you to be participants with demons.

Ye cannot drink the cup of the Lord, and the cup of devils: ye cannot be partakers of the Lord’s table, and of the table of devils.

You cannot drink the cup of the Lord and the cup of demons too; you cannot partake in the table of the Lord and the table of demons too.

For if any man see thee which hast knowledge sit at meat in the idol’s temple, shall not the conscience of him which is weak be emboldened to eat those things which are offered to idols;

For if someone with a weak conscience sees you who are well informed eating in an idol’s temple, will he not be encouraged to eat food sacrificed to idols?