Not exactly. The unbelieving Jews were given a blindness in part as prophesied in the OT. Once the time of the gentiles is fulfilled God’s focus will turn again to the jews( not that it really ever left) and Christ will establish a Jewish kingdom on earth and rule the earth for 1000 years.
an important point was that they had to reject Christ in order for the gentiles to be given the gospel- to in a sense ‘make the Jews jealous’ that God would give something so precious to the reviled ‘Dogs’, as Jews called gentiles back then- This was done I think to humble the Jew who had become so complacent and haughty about their relationship with God that they thought they could do whatever they liked because they were God’s chosen- God gave them a wake up call-
Another Reason the gentiles had to be included was so that noone could accuse God of favoritism- His love is for the entire world (although He DOES hate His enemies righteously) - and so that the unsaved could not use the excuse when the judgement day trolls around that they never had a chance, therefore they are not responsible for not begin saved therefore God could not punish them-
any person could become saved all down through mans’ existence by believing on the ‘coming messiah’ even though He hadn’t arrived yet— however the gentile world pretty much rejected God, and loved to follow false gods - it wasn’t until the Holy Spirit came that God’s word went out to the gentiles with power- (Not implying God’s word was impotent before then- but the Holy spirit did give power to the apostles to spread the word to thee heathen gentiles at this point like never before Because He really opened up the floodgates to salvation to them like never before-)
Up till Christ- the gentiles were so heathen that God had given them up to their lusts of their hearts- ie He handed them over to heir sins since that is what they wanted-
Therefore God gave them up in the lusts of their hearts to impurity, to the dishonoring of their bodies among themselves, because they exchanged the truth about God for a lie and worshiped and served the creature rather than the Creator, who is blessed forever! Amen. For this reason God gave them up to dishonorable passions. For their women exchanged natural relations for those that are contrary to nature; and the men likewise gave up natural relations with women and were consumed with passion for one another, men committing shameless acts with men and receiving in themselves the due penalty for their error (Romans 1:24-27, ESV).
Here’s a good article on the fact that gentiles were always allowed to be saved even before Christ came-
https://www.christiancourier.com/articles/1475-did-the-ancient-gentiles-have-the-hope-of-salvation