Paul wrote to the Philippian believers:
(Php 1:29 NKJV) For to you it has been granted on behalf of Christ, not only to believe in Him, but also to suffer for His sake,
So belief/faith is indeed a gift granted by God.
Truth we believe has become faith.
God first gives us the Word to believe in.
"So then faith comes by hearing,
and hearing by the word of God." Romans 10:17
Any part of the Word that has been clarified, and made understandable by someone presenting the Word to us accurately?
The faith that comes from it is a gift from God!
And, not only at the point of salvation.
So...
All accurate teaching that God brings our way.
And we believe it?
Becomes faith added to faith, and is His gift to us, for our spiritual growth and blessings in Christ!
We need to beware of false teaching for that reason.
False teaching is designed to rob and steal us of further growing in knowing Christ.
Nice pictures and a smiley face does not make for sound teaching.
It makes for salesmanship for a junk product designed to destroy our spiritual health.