Why not. He believes in God. That is a requirement.
Masonry is a religion.
Masons deny this.
Masons have a funeral service, a religious liturgy.
Masons have a requirement to be allowed to enter the celestial abode above. - their good works.
Jesus Christ has a requirement for us to enter Heaven - faith in His good work - on the Cross.
Masonry denies this Truth.
Should a Christian be a Mason?