No God doesnt desire the salvation of all mankind, but only the Salvation of all His Chosen People Israel from among all mankind. Salvation is for a specific people, which God hath promised to save in the Lord Isa 45:17
17 But Israel shall be saved in the Lord with an everlasting salvation: ye shall not be ashamed nor confounded world without end.
Israel here isnt a ethnic physical nation, but a Spiritual seed chosen in Christ. The seed of Israel Isa 45:25
25 In the Lord shall all the seed of Israel be justified, and shall glory.
This seed Israel is comprised of both jew and gentile believers Rom 4:16-17
16 Therefore it is of faith, that it might be by grace; to the end the promise might be sure to all the seed; not to that only which is of the law, but to that also which is of the faith of Abraham; who is the father of us all,
17 (As it is written, I have made thee a father of many nations,) before him whom he believed, even God, who quickeneth the dead, and calleth those things which be not as though they were.