lol, God gives belief in Christ, its a gift of grace and it causes belief in Christ.
Phil 1:29 doesn't say that God gives belief. It it about God giving the ability to believe. But your reformed spectacles warps your vision and you read verses quite wrong.
Christ died for everyone, as many verses plainly say. And NO verse says He died for only some.
So that in itself proves that salvation is available for everyone and man is free to believe or reject.