In many of the miracles He performed He marveled at their faith and said their faith made them well. It is a person's faith that allows for their Salvation through Faith in Him and His ability to save them through His sacrifice. Faith is our part. Believing what YAH said concerning His Son is how we are saved. Many verses tell us this.
If I understand your question correctly, the "faith in Him" does not mean faith towards Him. Instead, I think that it means
the faith that exists/resides within Him - that is, His faith. If you provide me the verse, I can check further.
Christ's faith is reckoned to those saved so in God's eyes it becomes as if it is their faith with all of the attendant attributes of His faith - righteousness, works, belief.
Look at it this way, if faith were ours to accomplish, then doing so would make us our own saviour. However, the Bible
makes abundantly clear that Christ alone is the Saviour. Observe:
[2Pe 3:18 KJV] 18 But grow in grace, and [in] the knowledge of
our Lord and Saviour Jesus Christ. To him [be] glory both now and for ever. Amen.