Normal
Just a second now, where does Guru Granth Sahib say not to marry a non sikh? Marriage is a personal choice and finding a suitable partner is a common sense question as someone else said above and not a religious one. If u can marry a Muslim and be happy with her and u both can respect each other and grow ur kids up to be good ppl then y not, go for it. It's not easy and we know this but no impossible.