Who are you or anyone to judge when it comes to pledging. The Bible plainly states that

To pledge total allegiance to any earthly authority would be to put worldly interests before spiritual interests. (Acts 5:29)

Exodus20:4-6 “You must not make for yourself a carved image or a form like anything that is in the heavens above or that is on the earth underneath or that is in the waters under the earth. 5 You must not bow down to them nor be induced to serve them, because I Jehovah your God am a God exacting exclusive devotion, bringing punishment for the error of fathers upon sons, upon the third generation and upon the fourth generation, in the case of those who hate me; 6 but exercising loving-kindness toward the thousandth generation in the case of those who love me and keep my commandments.

Who can argue with God's word? Can you?