The Celtic (Pagan) religion predated Christianity and was based off of meditation. The more aggressive Christian religion came in and killed and converted because that's the message of the bible. There's as much evil in the biblical religions as any place else.
Kill Followers of Other Religions.
If your own full brother, or your son or daughter, or your beloved wife, or you intimate friend, entices you secretly to serve other gods, whom you and your fathers have not known, gods of any other nations, near at hand or far away, from one end of the earth to the other: do not yield to him or listen to him, nor look with pity upon him, to spare or shield him, but kill him. Your hand shall be the first raised to slay him; the rest of the people shall join in with you. You shall stone him to death, because he sought to lead you astray from the Lord, your God, who brought you out of the land of Egypt, that place of slavery. And all Israel, hearing of this, shall fear and never do such evil as this in your midst. (Deuteronomy 13:7-12)
Kill the Entire Town if One Person Worships Another God
Suppose you hear in one of the towns the LORD your God is giving you that some worthless rabble among you have led their fellow citizens astray by encouraging them to worship foreign gods. In such cases, you must examine the facts carefully. If you find it is true and can prove that such a detestable act has occurred among you, you must attack that town and completely destroy all its inhabitants, as well as all the livestock. Then you must pile all the plunder in the middle of the street and burn it. Put the entire town to the torch as a burnt offering to the LORD your God. That town must remain a ruin forever; it may never be rebuilt. Keep none of the plunder that has been set apart for destruction. Then the LORD will turn from his fierce anger and be merciful to you. He will have compassion on you and make you a great nation, just as he solemnly promised your ancestors. "The LORD your God will be merciful only if you obey him and keep all the commands I am giving you today, doing what is pleasing to him." (Deuteronomy 13:13-19)
I think it's funny after all these centuries that people would still be preaching about the evils of other religions.
Deuteronomy was part of the OT law - ************ made a new and better covenant...
Heb 7:1 For this Melchisedec, king of Salem, priest of the most high God, who met Abraham returning from the slaughter of the kings, and blessed him;
Heb 7:2 To whom also Abraham gave a tenth part of all; first being by interpretation King of righteousness, and after that also King of Salem, which is, King of peace;
Heb 7:3 Without father, without mother, without descent, having neither beginning of days, nor end of life; but made like unto the Son of God; abideth a priest continually.
Heb 7:4 Now consider how great this man was, unto whom even the patriarch Abraham gave the tenth of the spoils.
Heb 7:5 And verily they that are of the sons of Levi, who receive the office of the priesthood, have a commandment to take tithes of the people according to the law, that is, of their brethren, though they come out of the loins of Abraham:
Heb 7:6 But he whose descent is not counted from them received tithes of Abraham, and blessed him that had the promises.
Heb 7:7 And without all contradiction the less is blessed of the better.
Heb 7:8 And here men that die receive tithes; but there he receiveth them, of whom it is witnessed that he liveth.
Heb 7:9 And as I may so say, Levi also, who receiveth tithes, payed tithes in Abraham.
Heb 7:10 For he was yet in the loins of his father, when Melchisedec met him.
Heb 7:11 If therefore perfection were by the Levitical priesthood, (for under it the people received the law,) what further need was there that another priest should rise after the order of Melchisedec, and not be called after the order of Aaron?
Heb 7:12 For the priesthood being changed, there is made of necessity a change also of the law.
Heb 7:13 For he of whom these things are spoken pertaineth to another tribe, of which no man gave attendance at the altar.
Heb 7:14 For it is evident that our Lord sprang out of Juda; of which tribe Moses spake nothing concerning priesthood.
Heb 7:15
And it is yet far more evident: for that after the similitude of Melchisedec there ariseth another priest,
Heb 7:16 Who is made, not after the law of a carnal commandment, but after the power of an endless life.
Heb 7:17 For he testifieth, Thou art a priest for ever after the order of Melchisedec.
Heb 7:18
For there is verily a disannulling of the commandment going before for the weakness and unprofitableness thereof.
Heb 7:19
For the law made nothing perfect, but the bringing in of a better hope did; by the which we draw nigh unto God.
Heb 7:20 And inasmuch as not without an oath he was made priest:
Heb 7:21 (For those priests were made without an oath; but this with an oath by him that said unto him, The Lord sware and will not repent, Thou art a priest for ever after the order of Melchisedec
Heb 7:22
By so much was Jesus made a surety of a better testament.
Heb 7:23 And they truly were many priests, because they were not suffered to continue by reason of death:
Heb 7:24 But this man, because he continueth ever, hath an unchangeable priesthood.
Heb 7:25
Wherefore he is able also to save them to the uttermost that come unto God by him, seeing he ever liveth to make intercession for them.
Heb 7:26
For such an high priest became us, who is holy, harmless, undefiled, separate from sinners, and made higher than the heavens;
Heb 7:27 Who needeth not daily, as those high priests, to offer up sacrifice, first for his own sins, and then for the people's: for this he did once, when he offered up himself.
Heb 7:28 For the law maketh men high priests which have infirmity; but the word of the oath, which was since the law, maketh the Son, who is consecrated for evermore.
Luk 22:19 And he took bread, and gave thanks, and brake it, and gave unto them, saying, This is my body which is given for you: this do in remembrance of me.
Luk 22:20 Likewise also the cup after supper, saying,
This cup is the new testament in my blood, which is shed for you.
Luk 22:21 But, behold, the hand of him that betrayeth me is with me on the table.
Luk 22:22
And truly the Son of man goeth, as it was determined: but woe unto that man by whom he is betrayed!
Joh 3:17 For God
sent not his Son into the world to condemn the world;
but that the world through him might be saved.
1Jn 1:9 If we confess our sins, he[************] is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness.
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FYI - Adolph Hitler and his minions in Nazi Germany also followed these same New Age beliefs.
History repeats itself - no surprise that we're edging closer to a potential repeat of WW2.