Who executes an innocent man? If the man is innocent and you execute him you may not answer for it in terms of being held responsible by the justice system but I promise you will answer in other ways. It will probably be in the form of you paying in some way or your own sons and daughters and or loved ones paying in some way.
And you will most certainly have to answer for it when you face God in the judgment. If the man is innocent do the right thing and release him. That is the right and humane thing to do. What good and decent person would knowingly execute an innocent man? Are you biased because of his religion? To hell with his religion, if he is an innocent man that should be the only thing that matters.
Deuteronomy 5:9 King James Version
9 Thou shalt not bow down thyself unto them, nor serve them: for I the Lord thy God am a jealous God, visiting the iniquity of the fathers upon the children unto the third and fourth generation of them that hate me.
Galatians 6:7 King James Version
7 Be not deceived; God is not mocked: for whatsoever a man soweth, that shall he also reap.
James 2:13 King James Version
13 For he shall have judgment without mercy, that hath shewed no mercy; and mercy rejoiceth against judgment.