@neologist,
That could be because you have some growing to do. You cannot drink the cup of the Lord and the cup of non believers. We are not to have any fellowship with non believers. We are not to cast our pearls before the swine. There isn't no problem with scripture just those who pervert it.
Eph 5:11
11 And have no fellowship with the unfruitful works of darkness, but rather expose them.
(NKJ)
1 Cor 10:20-22
20 Rather, that the things which the Gentiles sacrifice they sacrifice to demons and not to God, and I do not want you to have fellowship with demons.
21 You cannot drink the cup of the Lord and the cup of demons; you cannot partake of the Lord's table and of the table of demons.
22 Or do we provoke the Lord to jealousy? Are we stronger than He?
(NKJ)
Matt 7:6
6 "Do not give what is holy to the dogs; nor cast your pearls before swine, lest they trample them under their feet, and turn and tear you in pieces.
(NKJ)