Above is the Biblical definition of "faith". It is having a "conviction" that what God promises will happen even though it seems impossible. When you have this faith you know God will "adjust" things eventually so that what He has promised will happen.
Having faith in what you want, or what men say, or what you think should be done is not worth much. But having "faith" in what God has promised is of great value, and having that faith is considered "righteous" by God. An example is Abraham who believed God when He told him he would have a son in his old age and he would have many descendants.
Believing God is a righteous thing to do. Yet, Abraham died long before his "seed" became as numerous as the stars he saw that night. And he is not alone, many others named in the Bible died without seeing the promises God made to them fulfilled.
"And these all, being testified to through faith, are not requited with the promise of God..." (Hebrews 11:39)
Satan is a liar and his job has always been to convince people not to believe what God says. The Apostle Paul warned of this deception...
"Now the spirit is saying explicitly, that in subsequent eras some will be withdrawing from the faith, giving heed to deceiving spirits and the teachings of demons..." (1 Timothy 4:1-20
The apostle Paul tells us what not to believe...
"Now profane and old womenish myths refuse..." (1 Timothy 4:7)
Paul then tells us a promise from God that we are to have faith in, and teach to others...
Faithful is the saying and worthy of all welcome (for for this we are toiling and being reproached), that we rely on the living God, Who is the Savior of all humanity, especially of believers. These things be charging and teaching." (1 Timothy 4:9-11)
Any teaching which limits salvation to less than "all humanity" is not having faith in what God says, it is simply unbelief. Those few who now have faith in the salvation of all recognize this salvation is solely by the grace of God, apart from our own good works.
"For in grace, through faith, are you saved, and this is not out of you; it is God's present, not of works, lest anyone should be boasting..." (Ephesians 2:8-9)
Jesus Christ had biblical faith and "Jesus Christ's faith" was for all humanity and will eventually be possessed by all humanity.
"…a righteousness of God through Jesus Christ's faith, for all, and on all who are believing...”. (Romans 3:21-22 CLNT)
Some versions change the phrase "Jesus Christ's faith" to read “through faith in Christ Jesus” thus robbing humanity of the truth. That is how subtle Satan is, but such change is among the many "teachings of demons" found in institutional religion.
"For the One not knowing sin, He makes to be a sin offering for our sakes that we may be becoming God's righteousness in Him. Now, working together, we are also entreating you not to receive the grace of God for naught. For He is saying, In a season acceptable I reply to you, and in a day of salvation I help you. Lo! Now is a most acceptable era! Lo! Now is a day of salvation!" (2 Corinthians 5:20-6:2)
“For all sinned and are wanting of the glory of God. Being justified gratuitously in HIS GRACE, through the deliverance which is in Christ Jesus ...For the ration of Sin is death, yet the gracious gift of God is life eonian, in Christ Jesus, our LORD.” (Romans 3:23-24; 6:23)
"Let this mind be in you which was also in Christ Jesus: Who, existing in the form of God the Father, did not consider equality with God something to be grasped, but emptied Himself, taking the form of a servant, being made in human likeness. And being found in appearance as a man, He humbled Himself and became obedient to death—even death on a cross. Therefore God the Father exalted Him to the highest place and gave Him the name above all names, that at the name of Jesus every knee should bow, in heaven and on earth and under the earth, and every tongue confess that Jesus Christ is LORD, to the glory of God the Father." (Philippians 2:5-11)