The reason is because not all who profess to be Christians are Christians. A Christian is a disciple of Christ one who follows in the Masters footsteps. The first and foremost part of this discipleship is the full surrender and or consecration of oneself to the Father. Such and such alone if their consecration be accepted, “For no man takes this honor unto himself save he who is (first) called by God” are the only true Christians.
God is not calling everyone at this time; he is only seeking the select few who will be made copies of his dear son, these if proven faithful unto death will constitute the body of Christ, the true Church and will be used in the blessing of all the rest of mankind in due time.
The great majority of professed believers are “tares” imitation wheat, although they don’t fully realize it. Not all of them are bad people per say, many appear to be upstanding individuals, but alas many are hypocrites possessing a form of godliness but lacking the power thereof, that is they put on the airs of being a Christian, but their hearts (their words and actions) tell a different story.
The problem is that the standard for be a true disciple, a Christian has been lowered over time, now just about anyone can profess to be a Christian, of course this does not mean that they are truly Christians, nor that they have been begotten of the Father. Those who are begotten of the Father are begotten of truth, tares are begotten of error.
The true culprits in this deception have been the “blind guides” these have succeeded in convincing the majority that a mere profession of faith in Christ is all that is necessary to spirit begettal and to receive the Holy Spirit. Poor souls what they imagine to be the guidance of the Holy Spirit is nothing more than their emotions, “feelings”. The evidence that they are relying on feelings rather than the guidance of the Holy Spirit is that today they “feel” close to God, tomorrow far from him, it goes back and forth depending on how they “feel” from one day to the next.
The other evidence is that these generally give very little evidence of a knowledge of the “deep things” of the word of God, which only those guided of the spirit can comprehend. Allowances of course being made for those who are but “babes in Christ” who have not been properly educated in the truth due to various reasons, primarily because they remain in Babylon and there is very little truth there to feed upon, what little truth there is has been polluted through the doctrines and precepts of men.
Because the professing church is over-run with tares (the tare’s far out numbering the wheat) it is but natural that they hold all the leading positions in the professing church and thus dictate its teachings. These of course not being spirit begotten and therefore not spiritually minded can only perceive that which the natural man is capable of comprehending, thus the confusion and the conflicting creeds. And yes this has even affected how they perceive salvation works.