It seems some may think so as they quickly point to Matt. 24:24 where the Lord Jesus said "For false christs and false prophets will rise and show great signs and wonders to deceive, if possible, even the elect." Their reasoning is that "since I am elect, I can't be deceived" which is true, but only as far as this verse goes. This verse does not give a blanket exemption from all deception, only that which pertains to the identity of the Son of God as opposed to those who would falsely claim to be Him (John 10:1-5 & 27). If the believer were immune to all deception then why did Jesus say in Matt. 24:4 "Take heed that no one deceives you" and why did others warn us of men who would deceive us (Acts 20:29 & 30)? James specifically warned us "Do not be deceived, my beloved brethren" (James 1:16) about the beginning, progression, and end of our own sins. It is Hebrews 3:13 that warns us not to hardened by the deceitfulness of sin. To think that "because I am saved, I cannot be deceived about anything" is the height of folly and an open invitation to the deceiver which will result in all manner of hurtful exercises in a vain religion that can save no one.
Two of the main arenas of deception are the Word of God and the infallibility of the modern teachers of it. The Word has been under attack since the Garden of Eden when the deceiver posed a question to Eve "Yea, hath God said" and this same question still works masterfully to deceive mankind. The questions have branched out since then and become more complex (convoluted) with attacks on multiple fronts that seems to have no end. Note that none of the questions posed by the naysayers are ever answered, but continue on with more quires added, only to increase the confusion. Some have said that they do not seek a "resolution" as they favor a continued (endless) 'discussion.' The end game of whatever form the attack on the Word may take is doubt. Doubt in the reliability of the written Word (enter multiple "versions" that disagree with one another). Doubt as to the meaning of certain words, with the corresponding interpretation being brought under fire. This doubt extends to the very Character of God Himself. The deception will make Him out to be a "god of love" only, saving all of mankind in the end. An offshoot of this states that Christ's sacrifice was specifically for all mankind (as opposed to the Biblical theme being His death was specific only to and for the elect) which makes Christ's work subject to the will of man as to who will be saved, negating election. It also casts doubt on the sacrifice of the Lord because if He died to forgive the sins of all mankind then why are there people in hell and why are all the unrepentant cast into the Lake of Fire? There are no answers for these types of questions in this "other gospel." In the end all this doubt generated by the deceiver leads to immense confusion and more doubt, and rightly so since the deceiver is the author of confusion.
As for the illusion of infallibility in today's preachers, this is a requirement placed upon them by those that listen to them and give their money, time and support to them. They must be seen as infallible or they are not worth listening to, much less receiving money from them as their disciples. This is why every excuse under the sun is given for continued allegiance. Sins of all kinds are swept under the rug in favor of keeping their "golden boy" (calf) on his pedestal. Such people relish the mockery of God that continues unabated Sunday after Sunday in the "worship service" singing songs that have no basis in Scripture, listening to the fantasies told about their new god who has "replaced" the real God. They live lives that are evil and yet deem their life to be good. They listen to their Pulpit Jackal, bow before his wisdom and insight, and do not understand that it is all evil, their own ego unable to endure the revelation that they have believed a lie and hence they must maintain the illusion of infallibility for their "church," their "preacher," and themselves. If you are in this boat may God have mercy on you.
The first step to not being deceived is to recognize that you can be deceived which will lead quickly to a desperate cry to the Lord to keep you from being deceived. A cry which He never fails to grant as we see in Jude 24 "Now to Him who is able to keep you from stumbling..." Does the Word of God no longer captivate your heart? Then ask Him to renew a hunger and thirst for His righteousness (Matt.5:6) and see how quickly repentance and gratitude flood your heart. Short on wisdom, can't seem to understand what you read in the Word? Request from the Lord wisdom (James 1:5) and watch the Scriptures come alive to you, as you fed on His Word day after day. Don't expect terra-bite data dumps from the Word, but you will be fed every day, a little at a time. There are two places in Luke 24 that lets us know that we are all in need of His Spirit to reveal His Word to us. "Then their eyes were opened and they knew Him; and He vanished from their sight. And they said to one another, 'Did not our heart burn within us while He talked with us on the road, and while He opened the Scriptures to us'?" Along with "And He opened their understanding, that they might comprehend the Scriptures." Luke 24: 31 & 32 and 45. The only thing that keeps the heart, the mind, the eyes of a believer closed is sin.
"Afresh, precious, precious Jesus, I resign this body to You, for doing or suffering, for living or dying. Will You accept it? Will You use me for Your glory more than heretofore, that You may have some little return for all the benefits You have done to me? Oh, do grant this request; my heart longs for it, my spirit pleads for it; and "if You will, You can." You know the hot temptation of which I am the subject. Bring Your glory out of it, and keep me from the evil, and it shall be well." - Ruth Bryan