Well to be fair there are a number of scriptures that enjoin God's people NOT to mix the worship of the one, true God with pagan worship. For example:
Deu 18:9 When thou art come into the land which the LORD thy God giveth thee, thou shalt not learn to do after the abominations of those nations.
Paul's statement is stronger still:
2Co 6:14 Be ye not unequally yoked together with unbelievers: for what fellowship hath righteousness with unrighteousness? and what communion hath light with darkness?
2Co 6:15 And what concord hath Christ with Belial? or what part hath he that believeth with an infidel?
2Co 6:16 And what agreement hath the temple of God with idols? for ye are the temple of the living God; as God hath said, I will dwell in them, and walk in them; and I will be their God, and they shall be my people.
To me, this makes a pretty strong statement that the people who worship the one true God should not attempt to synthesize pagan worship symbols into Christianity no matter the intention.
The best illustration of this is the golden calf. Aaron attempted to incorporate pagan Egyptian symbols with worship of the one, true, God. For example:
Exo 32:4 And he received them at their hand, and fashioned it with a graving tool, after he had made it a molten calf: and they said, These be thy gods, O Israel, which brought thee up out of the land of Egypt.
Exo 32:5 And when Aaron saw it, he built an altar before it; and Aaron made proclamation, and said, Tomorrow is a feast to the LORD.
Note that Aaron said "the Lord"...which is translation of the word always used to denote the one, true God's name. In a way, Aaron was attempting to "Israelize" the egyptian pagan symbols. God didn't take kindly to that.
No kidding. But, just what the heck does that have to do with an obelisk?
Give me a break.