Why does anyone hate Christianity? What saith the scriptures?
John 3:19 And this is the condemnation, that light is come into the world, and men loved darkness rather than light, because their deeds were evil.
Romans 1:19-21 Because that which may be known of God is manifest in them; for God hath shewed it unto them. For the invisible things of him from the creation of the world are clearly seen, being understood by the things that are made, even his eternal power and Godhead; so that they are without excuse: Because that, when they knew God, they glorified him not as God, neither were thankful; but became vain in their imaginations, and their foolish heart was darkened.
1 Corinthians 2:14 But the natural man receiveth not the things of the Spirit of God: for they are foolishness unto him: neither can he know them, because they are spiritually discerned.
2 Corinthians 4:3-4 But if our gospel be hid, it is hid to them that are lost: In whom the god of this world hath blinded the minds of them which believe not, lest the light of the glorious gospel of Christ, who is the image of God, should shine unto them.
Ephesians 2:1-3 And you hath he quickened, who were dead in trespasses and sins; Wherein in time past ye walked according to the course of this world, according to the prince of the power of the air, the spirit that now worketh in the children of disobedience: Among whom also we all had our conversation in times past in the lusts of our flesh, fulfilling the desires of the flesh and of the mind; and were by nature the children of wrath, even as others.
An unconverted man (or woman) is naturally hostile (or averse) towards the things of God and for obvious reasons. They are dead in their sins, fugitives from justice, and are subjects of wrath! Think about it, if you were on FBI's "Ten Most Wanted" list, would you want to hang out with law enforcement personnel who would likely find you out and bring you to justice? It is only by the POWER OF GOD that one turns to (rather than fleeing from) God in repentance and faith!
The problem with many so-called "Churches" these days is that they often try to "reinvent" Christianity to make it more appealing and desirable to the masses. This may fill some seats at least temporarily but what use is there in a gospel message that has no transforming power? Liberal congregations appeal to the "goats" in the interest of acceptance and inclusion only to find that if the goats remain, they will ultimately take over and run off the sheep!
Stop trying to get the teenagers and young adults to "like" you! They need to have the devil preached out of them and those who do come will do so when they see the transforming power of the gospel working in your life first and foremost!