We are not to worship angels (spiritual/ messengers) .

Gal.1:8 But though we, or an angel from heaven, preach any other gospel unto you than that which we have preached unto you, let him be accursed.

Colossians 2:18 (King James Version)

Let no man beguile you of your reward in a voluntary humility and worshipping of angels, intruding into those things which he hath not seen, vainly puffed up by his fleshly mind,

Revelation 22:8-9 (King James Version)

And I John saw these things, and heard them. And when I had heard and seen, I fell down to worship before the feet of the angel which shewed me these things.Then saith he unto me, See thou do it not: for I am thy fellowservant, and of thy brethren the prophets, and of them which keep the sayings of this book: worship God.

All credit goes to the Almighty.We are lead by the Holy spirit.
Romans 8:38-39 (King James Version)

For I am persuaded, that neither death, nor life, nor angels, nor principalities, nor powers, nor things present, nor things to come,Nor height, nor depth, nor any other creature, shall be able to separate us from the love of God, which is in Christ Jesus our Lord.

2 Cor.11:14

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Note: Gen.19:1 And there came two angels to Sodom at even; and Lot sat in the gate of Sodom: and Lot seeing them rose up to meet them; and he bowed himself with his face toward the ground

Angels being messengers, we can be thankful for the message (Of YHVH) but may it remain aimed unto the Father. Lot was at "the gate" and this is to mention head of (seat of judgement:vs.9, 23:10,18; 34:20,24, Ruth 4:1) so he greeted them as his guests as to show respect (social greeting) and service to for he recognized them as angels of God.

Hebrews 13:2
Be not forgetful to entertain strangers: for thereby some have entertained angels unawares.

Zacharias murmored against an angel of God thus murmoring against God, As Israel did with Moses (YHVH) in the wildreness.

suggest http://friendsnchrist.ning.com/group/currentevents/forum/topics/demonic-killings