The Bible condemns such faiths, for faith--no matter how sincere--is only as valid as the object of that faith.
They say to wood, 'You are my father,' and to stone, 'You gave me birth.' They have turned their backs to me and not their faces; yet when they are in trouble, they say, 'Come and save us!' Where then are the gods you made for yourselves? Let them come if they can save you when you are in trouble! For you have as many gods as you have towns, O Judah. (Jeremiah 2:27-28)
So, if the Bible is so adamant about the futility of such faiths, then the "truth" the Bible puts forth had better be valid. In other words, there must be a great deal of evidence for the validity of Scripture as truth, or that verse would be nothing but a clever deception (not to mention the rest of it).
Interestingly, there is indeed a vast amount of evidence for the validity of Scripture--so much, in fact, there have been no accusations that have been able to stand their ground against it. What about the many accusations that the Old Testament was simply mythology? Ahh... but archeaology has brought silence to most of those and brought into serious question the rest. And, what about the theory Jesus never existed? Well, that has been soundly blasted out of the water. (For a small taste of this, see: Did Jesus Actually Exist?) And, what about the consipiracy theories--those that claim Jesus' disciples merely collaborated and made up the stories of Jesus so they could start a new religion? But, of course, those have been proven (through a study of extra-biblical historical documents, the religious and political history, the prophetic fulfillments, contextual coherency & accuracy, documental preservation, archeaology and eye-witness accounts) to also be false.
So, if there are so many evidences for the Bible's accuracy and validity and so few arguments against it, why doesn't everyone believe? Because spritual truth is given directly by God and only by God.
"The man without the Spirit does not accept the things that come from the Spirit of God, for they are foolishness to him, and he cannot understand them, because they are spiritually discerned." (1 Cor. 2:14) (See also Mat. 16:13-17)
It cannot be figured out. It does not come through study. It does not come by being born into it. It is a gift--and it is given only to those who have been called by God and respond to His call.
"No one can come to me [Jesus] unless the Father who sent me draws him. Everyone who listens to the Father and learns from him comes to me. This is why I told you that no one can come to me unelss the Father has enabled him." (John 6:44-45, 65)
Now, we are all called by God at one time or another. (See: Jeremiah 7:13, Matt. 18:10-14, John 3:16-17, 2 Peter 3:9) So, there are none that are not chosen to be His, but we are not all called at the same time nor in the same way. Also, even once we are called, we are not forced to believe. That is our choice--although God has made belief very available, simple and appealing. (I mean, what's not appealing about being forgiven for our sins, reunited with God--the omnipotent and loving Being who made us, having his all-knowing guidance during our lives and having the assurance of paradise with Him after we die?)
So, could Christians be buying into a false faith? No. Not as long as that faith is in Jesus Christ--fully God and fully man--as defined by the Scriptures (both Old and New Testaments but no other books). The question then is, why haven't you accepted Jesus yet? Is it because God hasn't called? Or, is it because you haven't answered? Hopefully, though, it isn't because you have rejected Him outright. If so, I ask you to take another look.
