Any number of "bendings" may start the slide down the slippery slope, which is then followed by any other "bending". All are rooted in either personal gratification or an skewed view of humanity and the Aleister Crowley view of "Do what thou wilt shall be the whole of the law". In other words, "If it feels good to you then no one else can say anything about it". You may also have heard this, seemingly harmless, put as "Live and let live". It does sound quite cushy and respective of others, but it can and is very damaging. Of course, this way of thinking is built around the post-modern thinks of "all truths are valid", which is self-contradictory and refutes itself in those 4 words.
Truth is a "static" thing; it doesn't move, it doesn't waver and it is fixed. Nothing can change a truth, nothing can prove a truth incorrect or invalid. Some people today would have you believe that "truth" is whatever you perceive as reality. This could go as far as saying 2+2=5 can be correct to you. Of course, anyone with a 1st grade education knows that 2+2=4 and that there is no wavering and no other correct answer. In that same vein, we know that reproduction of life is by one male and one female, that is a law of nature. Some would have you believe that it is perfectly "natural" for those of the same sex to have "relations" and to have the same relationship that heterosexuals do. In scripture it is called sin and an abomination to God, since He created man and woman to be one, not a perversion for sexual desires between same sex people. But some, even some that call themselves Christians, would say that the Word of God is incorrect, even try to make a mockery of God's Word by pulling in archaic verses out of context while saying, "If you think being gay is a sin, then so is eating shrimp or cutting your hair". Of course this is proof that this person doesn't know the Word of God and that they hold human desires above scripture. This is a very dangerous place to be for a person. It would be better if that person would just deny being a Christian, as their portrayal of being a follower of Jesus is actually blasphemous when they try to speak contrary to the Word of God.
So, the perception that lying is normal is one of the things that some people bend on. Others may be drunkenness, drugs, theft, hatred, gambling, sex outside of marriage, speeding, slothfulness, abortion and any number of other things that go against the Truths of God. Once you have bent and broken one, it is not hard to bend and break another, then another, then another and then end up in the mind state of "Live and let live. To each his own. Who am I to say something is wrong?" That is exactly why we, as the human race, need a solid foundation in which to put our trust - Jesus Christ.
God is unchanging (Malachi 3:6, James 1:17, Hebrews 13:8), very unlike our human existence. Look at the rise and fall of societies, look at the short life of the U.S.A. for example. See how morality has declined in just the past 40 years. This may be due to the lack of reverence for God or the lack of reverence may just be an evidence of the human quest for independence from God, the view that "we" are god and "we" choose our path. Thing is that "path" is a path to destruction without God. Wavering on just one single fact that is plainly laid out in scripture will always lead to other errors. Laying aside known Truth will always end in destruction, which is where our country and our world is headed.
In 1973 Roe V Wade set the path for infanticide, which has now led to a President and government that wants to force Christians to pay for this murdering of babies. This one court case, set into motion a series of events, a decline over 40 years that has culminated in 1.5 million baby murders per year, in the U.S.A alone. Our government not only allows these murders, but they promote and provide these murders. Show me in scripture where killing babies is a "good thing". Show me where telling a lie is acceptable or there is room given to make excuses for telling a lie to try and change the outcome of something. Where in the Bible does it say that "all truths are valid"? None of that is in there and Scripture condemns all of that. So we can only conclude that anyone who promotes the things that God condemns cannot be a Christian at all, they are trying to make a mockery of God and His Word.
The breaking point is always within our reach. This is why we must always rely on and go to God's Word for EVERYTHING. While it may not lay out, in detail, the particular issues you may be facing, the principles are there. Do not try to bend God's Word to fit your stinkin' thinkin'. Turn your heart to the Word and allow your mind to be transformed by the Word
And do not be conformed to this world, but be transformed by the renewing of your mind, that you may prove what is that good and acceptable and perfect will of God.