We are free to ask God to over come the free will of others and bring them to repentance. Such prayers are a most earnest expression of Christian mercy. From our tradition (TLH 1941);
"Almighty God, our heavenly Father, whose property it is always to have mercy, we most earnestly beseech you to visit with Your Fatherly correction all such as have erred and gone astray from the truth of Your holy Word and to bring them to a due sense of their error that they may again with hearty faith receive, and hold fast to Your unchangeable truth; through Jesus Christ, Your dear Son our Lord."
"Almighty , merciful, and gracious God and Father, with our whole heart we beseech You for all who have forsaken the Christian faith, all who have wondered from any portion thereof or are in doubt or temptation through the corupters of Your Word that You would visit them as Father, reveal to them their error, and bring them back from their wanderings, that they , in singleness of heart, taking pleasure alone in the pure truth of Your Word, may be made wise unto everlasting life through faith in Jesus Christ, Your Son, our Lord."
Pray boldly!