God doesn't oppose rituals,
He just doesn't like it when we worship any other thing other than Him.
Yes our God is a jealous god,
He is after all the God of all gods,
And the King of kings.
So even if there may be others out there...
There is only One true God to worship, whole heartedly.
Christianity isn't polytheism,
One can't follow multiple gods and expect Jesus to be okay with it.