Can an apostate receive forgiveness?

[tonychanyt]

Paul visited James and the brothers in Jerusalem in Acts 21. They updated him on the accusation against him, Berean Literal Bible:

21 ""Now they have been informed about you, that you teach all Jews among the Gentiles apostasy from Moses, telling them not to circumcise the children nor to walk in the customs."

Strong's Greek: 646. ἀποστασία (apostasia) — 2 Occurrences

They accused Paul of teaching rebellion against Judaism and Moses. Paul was not advocating rebellion or apostasy against Moses but clarifying the role of the law in light of Christ's fulfillment of it (Romans 10:4).

BDAG:

defiance of established system or authority, rebellion, abandonment, breach of faith

An apostate was defiant.

2 Thessalonians 2:

3 No one should deceive you in any way, because it is not until the apostasy shall have come first, and the man of lawlessness shall have been revealed—the son of destruction, 4 the one opposing and exalting himself above every so-called god or object of worship—so as for him to sit down in the temple of God, setting forth that he himself is God.

There will be a future rebellion/apostasy among Christians and non-Christians against Christ.

Can an apostate be forgiven?

If he is so rebellious and defiant that he refuses to repent, then he will not be forgiven. If he repents, then God will forgive him.